Question

what is the central idea of a text?
the feeling or emotion that a text provokes in the reader
a conclusion based on evidence and background knowledge
a series of ideas that support a main point
the main point the author is trying to make

Explanation:

The central idea of a text is the main point the author is trying to convey. It is not about the emotions it provokes (that's mood/affect), not a conclusion (though related in some texts but not the definition here), and not the supporting ideas (those are details for the central idea).

Answer:

the main point the author is trying to make