Step 1: Understand the question structure.
The correct question word to ask about someone’s knowledge of you is "Who," as it refers to a person. Step 2: Analyze each option.
- (A) What: Incorrect. "What" is used for objects or things, not people.
- (B) When: Incorrect. "When" refers to time, not knowledge of a person.
- (C) Who: Correct. "Who" is the correct word to ask about a person who knows you.
- (D) Where: Incorrect. "Where" refers to a place, not knowledge of a person. Step 3: Conclusion.
The correct question is "Who doesn't know you?"