Answer: C (how many hours a day does Allen spend on his math homework?
Explanation:
A statistical question is a "question that can be answered by collecting data that may vary."
All the other questions (the incorrect choices) all have one answer. However, the question of the amount of hours Allan spends on math homework can vary as he may not spend only a specific amount of hours per day. (He might spend 2 hours one day and 3 hours the next.)