Answer:
Use the three each.
Step-by-step explanation:
In 1. Use the appeal to ethics, make a valid argument why your parents should buy the rabbit. It could help with school stress, etc.
2. Use the "I'll be so happy and I'll take good care of it" argument, I think we've all used that one before.
3. Say why it's logical to have one. There's no reason you shouldn't get a bunny if you're well behaved, do your chores, have good grades, etc.