Kaleb Developed a Fear of Snowstorms Two Winters Ago When

Multiple Choice

Kaleb developed a fear of snowstorms two winters ago when his car spun off the road and hit a tree during a blizzard. As the winter progressed, and he had no further accidents, Kaleb thought his fear of snowstorms had pretty well disappeared. To his surprise, this winter when the first heavy snow started to fall as he was driving, he found his heart was pounding and he was trembling. What does this illustrate?

A) extinction
B) stimulus generalization
C) second-order conditioning
D) spontaneous recovery