To critique a text, readers find details to support the author's central idea
look to discover the text's most important idea
examine and explain their position on a central idea
write an analogy that explains the text's main idea

C). examine and explain their position on a central idea.

Explanation:

In order to evaluate or critique a text, the readers are required to inspect and elaborate their stand on the central idea along with sufficient evidence to substantiate their claim. He/she needs to first explain the intent and purpose of the author behind the text followed by an analysis of the language or structure employed in it to communicate the meaning to the readers. After this, he/she can keep his point(in favor or opposition) and make comments regarding it along with justifying reasons to establish its validity. Thus, option C is the correct answer.

this isnt an english question.