In the following question on sentence arrangement, four labelled sentences P, Q, R and S are given. When properly ordered, they form a coherent paragraph about health and fitness. Select the option that represents the most logical sequence of these sentences.

Introduction / Context:
This question assesses the ability to arrange four jumbled sentences into a logically coherent paragraph. All four sentences discuss the importance of health and fitness in the modern environment. To arrive at the correct order, the candidate must identify the best introductory sentence, the supporting details, and the concluding idea, while ensuring that each sentence connects smoothly to the next one.

Given Data / Assumptions:
The four sentences are as follows:
R: In the modern time, where pollution, global warming and other environmental issues have covered us, the importance of health and fitness has increased to a great extent.
P: We need to be more physically healthy and fit to win the current environmental challenges.
Q: It keeps us away from the diseases, infections and other lethal diseases by reducing extra kilos, improving the strength of muscle and bones, increasing immunity level, and maintaining the healthy functioning of our major body organs.
S: It helps us to look better with lots of patience and confidence level.
- Options provide several possible orders, and we must choose the one that yields a well structured paragraph.

Concept / Approach:
A typical paragraph begins with a sentence that sets the context and introduces the main idea. Here, sentence R clearly mentions the modern time, pollution, global warming, and environmental issues, and states that the importance of health and fitness has increased. This makes R a strong candidate for the introductory sentence. The next sentence should logically explain what we need to do in response, which is described in P. After that, Q and S both explain benefits of health and fitness, with Q emphasising disease prevention and S focusing on appearance and confidence. Therefore, Q and S naturally follow as detailed benefits.

Step-by-Step Solution:
Step 1: Choose the introduction. Sentence R clearly sets the scene by describing the modern world with pollution, global warming, and environmental issues, and it highlights why health and fitness are important. Thus, R should come first. Step 2: Decide what follows R. Once the importance is stated, the paragraph should move to what we need to do. Sentence P states, "We need to be more physically healthy and fit to win the current environmental challenges," which logically follows from R. Step 3: Consider which sentences should come next. Both Q and S begin with "It", referring back to health and fitness. Q explains physical and medical benefits such as preventing diseases and improving immunity. Step 4: After Q describes health benefits in detail, S continues the idea by adding another positive outcome: improved appearance, patience, and confidence. Step 5: Therefore, the sequence R (context), P (need), Q (health benefits), S (additional benefits) produces a coherent paragraph. This order corresponds to the option RPQS.

Verification / Alternative check:
Reading the sentences together in the order RPQS gives a smooth flow: first the modern environmental challenges are introduced (R), then the need to stay fit is stated (P), then physical and medical benefits are listed (Q), and finally psychological and aesthetic benefits are added (S). This is logical and cohesive. Other orders either start without proper context, put detailed benefits before explaining why health and fitness are needed, or break the natural flow from general situation to specific advantages.

Why Other Options Are Wrong:
- PQRS starts directly with our need to be fit without explaining the modern environmental context first; it lacks a clear background introduction.
- QPRS opens with benefits before explaining why fitness has become more important, which feels abrupt and unanchored.
- PRQS starts with a general need (P) but only later brings in the modern environmental context (R), resulting in an awkward shift.

Common Pitfalls:
Candidates sometimes look only at pronouns like "It" and assume that any sentence containing such a pronoun must immediately follow another, without considering whether the overall story makes sense. Another pitfall is ignoring the time setting "In the modern time" in R, which clearly signals the best starting point. When arranging sentences, always search for the broadest contextual statement first, then move toward more specific needs and finally to lists of benefits or results.

Final Answer:
The most logical order of the sentences is RPQS.