# Choose the correct answer
The question is "Are rabbits fast?" which is asking about the general speed of rabbits.

The correct answer should describe the speed of rabbits.

A. Yes, they run very fast - This option correctly describes the speed of rabbits and matches the subject-verb agreement.

B. They are running - This option describes an action that rabbits might be doing at a specific moment, but it doesn't directly answer the question about their general speed.

C. Yes, it is - This option uses the wrong pronoun ("it" instead of "they") for referring to rabbits in general and doesn't directly describe their speed.

The best answer is A. Yes, they run very fast.