Question

Quotations are mainly used to

A) organize important information.
B) decide about the reliability of information.
C) credit the source of a piece of information.

Answer 1

We usually use quotations to C) credit the source of information, such as someone speaking.  

Answer 2

According to dictionary quotations are a group of words taken from a text or speech and repeated by someone other than the original author or speaker.
Quotations are mainly used to credit the source of a piece of information
quotations are used to show spoken words by some body