Answer with Explanation:
You haven't provided the title of the text or passage so I'll answer it according to my own understanding.
Providing the central idea in a text/passage is a very important role for an author or writer. The central idea focuses on what the topic of the text is all about. It controls the direction of the writing. Most of the time, the central idea is located at the first section or the beginning of paragraphs. However, it can also be found at the end. Sometimes the thought is stated while other times, they're implied. This means that it is up to the reader to find out the meaning by reasoning out according to his/her understanding. The author develops the central idea by providing supporting details. These details help explain or give an example or illustration on what the main idea is all about.
