I took revenge ___ my enemy.

This question tests the correct usage of prepositions in English, a foundational concept in grammar. The phrase 'take revenge' requires a specific preposition to form a grammatically correct and idiomatic expression.

• The correct preposition to use with 'take revenge' when referring to the target of the revenge is on. Thus, 'I took revenge on my enemy' (Option C) is the correct phrasing.
• Using 'From' (Option A) or 'To' (Option B) would be grammatically incorrect in this context. 'From' would imply receiving revenge, and 'To' would imply giving revenge to someone, neither of which fits the standard idiom for taking revenge against an enemy.