Which of the following is a rhetorical question?

The rhetorical question would be C. Do birds fly?

Explanation:

This is because obviously everyone knows that a bird flies, therefore that question would be asked to prove a point, another rhetorical question would be: Am I typing these words right now? Obviously I am or you wouldn't get this answer.

answer; i believe that the correct answer is (chronological order);

i believe the answer is c