The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.

(P) Biographies of great men can also help us in learning good manners.

(Q) Courtesy and politeness is the key to good manners.

(R) No doubt these are little words but if they are spoken at the right moment and in a soft and sweet voice, they are bound to work wonders.

(S) The use of polite words like "Sorry", "Please", "Thank you", "Beg your pardon", "Sir" etc. creates a healthy impact on the minds of others.