S1: Politeness is not a quality possessed by only one nation or race. P : One may observe that a man of one nation will remove his hat or fold his hands by way of greetings when he meets someone he knows. Q : A man of another country will not to do so. R : It is a quality to be found among all peoples and nations in every corner of the earth. S : Obviously, each person follows the custom of his particular country. S6: In any case, we should not mock at others habits. The Proper sequence should be: A. RPQS B. RPSQ C. PRQS D. QPRS

The correct answer is: C. PRQS

The first sentence (S1) introduces the topic of the paragraph, which is politeness. The second sentence (P) provides an example of a polite gesture that is common in some cultures but not others. The third sentence (R) states that politeness is a quality that is found in all cultures. The fourth sentence (S) explains that people from different cultures may have different customs, and that we should respect these differences. The fifth sentence (S6) concludes the paragraph by stating that we should not mock the customs of others.

The other options are incorrect because they do not follow the logical order of the sentences. For example, option A (RPQS) puts the second sentence (P) before the first sentence (S1). This is not logical because the second sentence provides an example of the topic that is introduced in the first sentence. Option B (RQPS) puts the third sentence (R) before the second sentence (P). This is also not logical because the third sentence is a general statement about politeness, while the second sentence is a specific example of politeness. Option D (QPRS) puts the fourth sentence (S) before the second sentence (P). This is also not logical because the fourth sentence is a statement about cultural differences, while the second sentence is an example of a polite gesture.