B - agenda
An agenda is what the author really wants to point out (their underlying message) and it's typically written in a way where it's somewhat hidden. Example: political ads - they have an agenda for what they want to talk about and why it's important.
Heliology
from the word helios meaning sun, and logos meaning study.
What are the options?
A good question would be : What was the main idea?
Research your topic and take notes, mate
