Important and relevant details support
a. the author's point of view
b. your opinion about the topic
c. the central idea of the text

The correct answer is C. The central idea of the text

Explanation:

In each text, there is a central idea or thought, and the purpose of the author is to develop this idea. This is possible when the author adds relevant details such as sub-ideas, evidence, examples, etc. related to this central idea. For example, in a text about the history of technology, the author will need to add details about relevant technological advances in different historical periods. This implies the important and relevant details are used to explain, support and develop the central idea of the text, rather than to support your opinion or the author's point of view.