sniffing to find food panting when it feels hot chasing a squirrel up a tree barking when it wants to go outside
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Dogs have some learned behaviors. Which is most likely a learned behavior in a dog?
Possibilities:
- sniffing to find food
- panting when it feels hot
- chasing a squirrel up a tree
- barking when it wants to go outside

barking when it wants to go outside