Rearrange the parts of the sentence on good manners in the correct order to form a coherent paragraph about children and manners.

Introduction / Context:
This sentence rearrangement question is about the importance of good manners for children. Four parts have been jumbled and labelled P, Q, R, and S. We have to find the sequence that gives a smooth explanation from observation to conclusion.

Given Data / Assumptions:

P: Children with good manners are liked by one and all.
Q: They are appreciated even by strangers.
R: All round development of a child is possible only if a child is groomed in good manners.
S: Therefore, the public schools lay great emphasis on the cultivation of good manners in their students.
We must reorder them logically.

Concept / Approach:
The paragraph should begin with a general observation about children with good manners, then reinforce that observation, then explain its importance for development, and finally show the practical result in schools. P gives the main observation. Q supports it by adding that even strangers appreciate well mannered children. R then generalises the significance of good manners for overall development. S concludes with a "Therefore" sentence that shows why schools emphasise manners. The sequence P Q R S matches this progression and corresponds to option PQRS.

Step-by-Step Solution:
Step 1: See which sentence can open the paragraph. P introduces the topic by stating that children with good manners are liked by everyone. This can stand alone and clearly sets the theme. Step 2: Q uses the pronoun "They" to refer to the children just mentioned in P, and adds extra information that even strangers appreciate them. So Q naturally follows P. Step 3: R moves from observation to explanation by stating that all round development is possible only if a child is groomed in good manners. This deepens the discussion beyond simple liking. Step 4: S begins with "Therefore", indicating a conclusion or consequence. It explains that public schools emphasise good manners because of their importance outlined in the previous sentences. Step 5: Thus, the order P Q R S is coherent and matches option PQRS.

Verification / Alternative check:
Read the full paragraph in the P Q R S order. It flows smoothly from the basic fact that well mannered children are liked, to further appreciation by strangers, to the importance of manners for development, and finally to the logical consequence that schools focus on teaching manners. Other orders either place the conclusion too early or disrupt pronoun references like "They" and the connector "Therefore".

Why Other Options Are Wrong:

QPSR: Starting with Q uses "They" without telling us who "They" are, causing confusion.

RSQP: R as the first sentence jumps into the idea of all round development without first mentioning children with good manners. The later references to "They" and "Therefore" also become less clear.

SRPQ: S begins with "Therefore", which indicates a conclusion but appears without any visible prior reasoning if placed first.

PRSQ: In this order, S would come before R, so the "Therefore" conclusion would appear before the sentence that gives the reasoning about all round development, which is illogical.

Common Pitfalls:
Students sometimes ignore pronouns and logical connectors, focusing only on whether sentences look general or specific. However, words like "They" and "Therefore" are strong signals. Always trace what each pronoun refers to and make sure that reason comes before result in a paragraph.

Final Answer:
The correct arrangement of the parts is PQRS.