Answer: A) reality vs. fantasy.
Explanation: In the given excerpt from "Don Quixote" by Cervantes, we can see developed the theme of fantasy vs. reality. Don Quixote sees the friars of St. Benedict as evil magicians that he has to fight to save a damsel. This is not the reality, but as much as Sancho tries to convince him, Don Quixote is decided to fight them (we see a lot of similar situations through the story). So the correct answer is option A.