Heros are most likely the protagonist of the story, the ones who are the most powerful and fight for the good in the book, the ones who save everyone in the story.
For example: In the Harry Potter series, he always meets Lord Voldemort at the end, and he wins the battle, like in the Chamber of Secrets at the end of that book.
<span>I shall have learned what little
there is about greatness.</span>
Answer:
A, for me seems likely but D is also possible
