What is a central idea of "Perseus and the Quest for Medusa's Head"? A) Medusa and her sisters pose a threat to the Greek world until Perseus figures out how to obtain Medusa's head and take it home as a gift to the king.

B) Perseus must rely on the gods to help him visit faraway lands and complete dangerous missions.

C) Perseus doubts himself after making a rash promise, but with the help of the gods and his own skills, he is able to fulfill the promise and rid a country of their tyrant king.

D) A cruel king receives what he deserves after tricking people into making silly promises.