Option C is the correct answer.

Propitiate means to win or regain the favour of (a god, spirit, or person) by doing something that pleases them.

The opposite of this would be something that causes anger or displeasure, which is option C: "Enrages." This means to make someone very angry.

While "depresses" refers to making someone feel sad or down, it doesn’t directly oppose the idea of "propitiates," which is about winning goodwill or favour.

The words "excites" and "appeases" does not have an opposite meaning of the given word.