The correct answer is B. What is this mostly about?
Step-by-step explanation:
The main idea of any text is the central idea of a text, this means the point the text is trying to show to the reader and that is usually expressed by the main idea in each paragraph of the text, usually placed at the beginning of each paragraph. Thus, in the case of informational text that aims at informing the reader about one specific topic, situation or issue the main idea is the point the author is trying to inform the reader about or in general terms what the text is about and what it is trying to inform about.