What Is the Problem of Evil

What is the problem of evil?

A) It is the question raised by the fact that there is evil in the world, despite the fact that God is omnipotent, omniscient, and perfectly good.
B) It is the question of whether people are fundamentally good or bad
C) It is the question raised by the fact that people work at reforming the world but evil remains
D) It is a question about whether power necessarily makes people evil