In the following question on sentence arrangement, four labelled sentences P, Q, R and S are given. When properly sequenced, they form a coherent paragraph about global warming. Select the option that gives the most logical order of these sentences.

Introduction / Context:
This question tests the candidate's ability to arrange jumbled sentences into a logically coherent paragraph. The four labelled sentences P, Q, R and S all discuss global warming, but they must be placed in an order that creates a smooth flow from general idea to specific causes and explanations. Skills in coherence, cohesion, and paragraph structure are crucial for success in reading comprehension and writing tasks, and this question is designed to evaluate those skills.

Given Data / Assumptions:
- Four sentences are given:
Q: There are many causes of the global warming which affects human lives and health in many aspects.
P: The main cause of global warming is the human being's careless activities.
R: Fossil fuels burning for many reasons are highly responsible to increase global warming.
S: Ever increasing human population is demanding more resources to live easy and healthy life such as land to live and for crop cultivation, technological growth for comfort and to deal with increasing temperature of atmosphere, etc.
- We must choose the sequence that forms the best structured paragraph out of the options QPSR, PQSR, RPQS, and SPQR.
- A good paragraph usually moves from a general statement to more specific details or examples.

Concept / Approach:
For sentence arrangement, the usual approach is to identify the introductory sentence, link supporting ideas, and check how each sentence connects to the next. The introductory sentence should broadly introduce global warming and its many causes. Subsequent sentences should narrow down to main causes, and then possibly mention more detailed explanations such as human activities, fossil fuel use, and population growth. Logical connectors like "the main cause", "fossil fuels", and "ever increasing human population" guide us in determining the correct order.

Step-by-Step Solution:
Step 1: Identify the best opening sentence. Sentence Q talks generally about many causes of global warming and its effects on human life. This makes it a natural introductory sentence. Step 2: After Q, we expect an explanation of the main cause. Sentence P directly begins with "The main cause of global warming is the human being's careless activities", clearly following from Q. Step 3: Sentence S explains one major type of careless human activity, namely the ever increasing human population and its demand for more land, resources, and technological growth. This supports the idea stated in P. Step 4: Sentence R mentions "Fossil fuels burning for many reasons" as another human related cause that is "highly responsible to increase global warming", which acts as a further detail and fits well after S as another example of harmful human activity. Step 5: Putting this sequence together, we obtain Q (general causes) → P (main cause: human activities) → S (population and resource demand) → R (fossil fuel burning). This corresponds to the option QPSR.

Verification / Alternative check:
To verify, read the four sentences in the proposed order as a continuous paragraph. The paragraph starts by acknowledging that global warming has many causes and affects human life in many ways (Q). It then narrows down to human carelessness as the main cause (P). S elaborates on one major aspect of that carelessness, the ever increasing population and its demands. R adds another specific factor, burning fossil fuels, which is widely recognised as a key driver of global warming. The narrative becomes more detailed and remains focused on human contributions, which is logically sound. Other options either start with specific details before giving a general statement or mix causes in a less coherent fashion.

Why Other Options Are Wrong:
- PQSR starts with the main cause before acknowledging that there are many causes, which reverses a natural general to specific order and feels slightly awkward.
- RPQS begins with a specific detail about fossil fuels, then jumps to general causes, which breaks the logical progression of ideas.
- SPQR opens with population details, which feels too narrow as an introduction, and does not clearly lead into a structured explanation of multiple causes.

Common Pitfalls:
Students may be tempted to select sequences simply because consecutive sentences share similar vocabulary, without checking the overall flow of ideas. Another common mistake is to overlook the importance of a broad introductory sentence that frames the whole paragraph. Remember that well written paragraphs tend to move from general statements to specific examples and that expressions like "the main cause" or "another factor" often signal a shift from overview to detail. Checking for coherence by reading the paragraph aloud in the candidate sequence can help catch awkward jumps or breaks.

Final Answer:
The most logical sequence of sentences is QPSR.