Ertha became conditioned to cry every time she saw an onion chopper because she associated it with cutting onions, which always made her eyes water. For weeks, the onion cutter sat on the counter with no onions. Eventually she never cried when she saw the cutter. Then the onion cutter disappeared for two months, and when Bertha saw it again for the first time, she began to cry. This response is known as
a. positive reinforcement.
b. negative reinforcement.
c. spontaneous recovery.
d. reconditioning

The answer is c. spontaneous recovery.

Explanation:

In classical and operant conditioning, spontaneous recovery refers to the sudden reapparition of the response to a stimulus, even when it was believed  to be extinct. Spontaneous recovery usually occurs after a period in which the conditioned stimulus was not present, as in the example.

This phenomenon is important to understand that an extinct behaviour is not the same as an unlearned behaviour.

carefully examine the map above. based on your knowledge of colonialism in africa, the area attributed to belgium on this map is most likely the democratic republic of the congo.