The purpose of language is communication- not communication in a void, but communication between the writers or speakers and their audiences. Communication styles of writers and speakers will reflect their personalities and backgrounds. However, the way they express themselves should be consistent with the nature and background of their audiences.
The main idea of this paragraph is that

a) the language people use reflects their backgrounds and natures.
b) how people speak must reflect their audiences' backgrounds and natures
c) communication does not take place in a void, but between people
d) to communicate effectively, people should consider their audiences while being themselves

Because language is the fundamental means of expression and communication in daily life, and speaking, writing, and reading are essential parts of that process. So, the main idea of the paragraph is that the language people use reflects their backgrounds and natures.

One of the most crucial aspects of every civilization is language. It is how individuals interact with one another, form bonds with one another, and foster a feeling of community. Language is an essential part of communication, which is a fundamental characteristic of every culture.

As language evolved, many cultural societies used sounds to construct their shared understandings. Intercultural communication is a symbolic process that builds, upholds, fixes, and transforms social reality. One of the hardest challenges for people from diverse cultural backgrounds to overcome while interacting is language.

Hence the correct option is, A. the language people use reflects their backgrounds and natures.

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