The practical aspects of communicating with others, or the social “niceties” of language, are referred to as

The practical aspects of communicating with others, or the social “niceties” of language, are referred to as pragmatics. 
Pragmatics deals with language in use and the contexts in which it is used. So, your use of language will change depending on the social situation or the people you are talking to.

Here is my best translation:   text analysis.1. read the text.2. determine the main idea of the text.3. determine the type and style of speech.4. write out 5 words and choose synonyms for them.5. find in the text all possible language tools (trails).blessed is he who was young in his youth,blessed is the one who has matured in time,who gradually lives coldwith years i could do it; who did not indulge in strange dreams,who did not shun secular black people,who at twenty was a dandy or a grip,and at thirty is profitable married; who was freed in fifty? from private and other debts,who fame, money and rankscalmly in turn achieved,about whom they have insisted for a whole century: n. n. is a wonderful person.(as pushkin).

The correct answer in this question  is option c. people in mountainous areas tend to be more isolated from other populations. this is the reason why their local languages do not spread. farming is their  one way of living among the highlanders.