a mouse pushing a lever to release food a dog going to a food bowl when a bell rings students receiving star stickers for good behavior the brain signaling blood vessels to return to normal
I gave my students this multiple choice question: Which situation is an example of a feedback system in the body that maintains homeostasis?

Only one answer is correct among these 4 choices:
- a mouse pushing a lever to release food
- a dog going to a food bowl when a bell rings
- students receiving star stickers for good behavior
- the brain signaling blood vessels to return to normal

Could you tell me which one is correct?

the brain signaling blood vessels to return to normal