Which of these best expresses why it is important to understand the structure of language?

a) to express ideas and feelings effectively
b) to get better grades on essays
c) to keep up with changes in language
d) to maintain a clear separation between man and animal

A
Language is used to express ideas, thoughts and events. The understanding of the structure of a language helps one convey these in a better manner.

Adjective clauses  begin with words such as that, when, where, who, whom, whose, which, and why. an essential (or restrictive)  adjective clauseprovides information that is necessary for identifying the word it modifies. so for example*** wrong= i the man gave me direction. example right ( i the man who gave me the  direction.