The answer to this is B. They're using a direct method which means the reader is telling you. No characters in the story are going to reveal it, only the reader will tell you in the story.
Example. The apparition was actually a small male child that was holding a balloon.
We just need to check who wrote the book "The Praise of Folly": it was <span>Desiderius Erasmus of Rotterdam, who wrote it in 1509 and published in 1511, so the correct answer is a. </span>
Explanation:
Don John spoiled the wedding because he was bitter and wanted to make his brother look bad. He was the illegitimate brother, you see. Don Pedro was the legitimate brother.