After a Fear-Provoking Biking Accident, Alex Extinguished His Conditioned Fear

Multiple Choice

After a fear-provoking biking accident, Alex extinguished his conditioned fear of bikes by cycling on a safe biking trail every day for a week. The reappearance of his previously extinguished fear when Alex rode a bike on the same trail two weeks later best illustrates

A) latent learning.
B) intermittent reinforcement.
C) instinctive drift.
D) spontaneous recovery.