sniffing to find food panting when it feels hot chasing a squirrel up a tree barking when it wants to go outside
I gave my students this multiple choice question: Dogs have some learned behaviors. Which is most likely a learned behavior in a dog?

Only one answer is correct among these 4 choices:
- sniffing to find food
- panting when it feels hot
- chasing a squirrel up a tree
- barking when it wants to go outside

Could you tell me which one is correct?

barking when it wants to go outside