Answer:
Spontaneous recovery.
Step-by-step explanation:
Latent learning refers to a person learns something but doesn't show it immediately but at a later time when it is needed.
Extinction refers to a decrease in a certain behavior because the reinforcement was eliminated.
Spontaneous recovery is a situation in which a response that had been eliminated appears again.
Reinforcement refers to anything that encourages a certain behavior.
According to this, Peter asking for a penny after a period of 3 months exemplifies spontaneous recovery.