After a Dog Had Been Conditioned to Salivate at the Sight

Multiple Choice

After a dog had been conditioned to salivate at the sight of meat powder, the meat powder was presented to the dog every three minutes and held just out of the dog's reach. Over the course of several trials, the amount of saliva the dog secretes decreases to zero, indicating that _____ had occurred.

A) negative reinforcement
B) biological preparedness
C) extinction
D) spontaneous recovery