Mariah Developed a Fear of the Water When She Fell

Multiple Choice

Mariah developed a fear of the water when she fell off a river raft last summer.This year she took swimming lessons and thought she had finally overcome her fear of water.She was eagerly anticipating an upcoming rafting trip; however,as soon as she stepped onto the raft she was instantly terrified again.What process does this illustrate

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