Answer:
B. the main point the author is trying to make in a text.
Step-by-step explanation:
The central idea of a text refers to the main point that an author is trying to make in a text. When an author writes a text, his purpose is to prove a particular point or defend a particular argument. This is the author's claim. In order to do so, he provides evidence of this view throughout the text. This is known as the central idea of a text.