Which Behavior Likely Involves a Response That a Subject Is

Which behavior likely involves a response that a subject is highly prepared to learn?

A) A dog learns to bark at the door in order to be let out every morning.
B) A cat learns to walk on a leash.
C) A parrot learns to hold out its wing to signal to the owner that it is time to be fed.
D) A child learns to share the family computer with siblings who also want to play computer games.