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Which of the following situations demonstrates spontaneous recovery?

A

A dog, which has been conditioned to salivate at the sound of a doorbell, begins to salivate to the sound of all bells.

B

A dog, which has been conditioned to salivate at the sound of a doorbell, ceases to salivate at the sound of the doorbell and only salivates when food is present.

C

A dog, whose conditioned response has become extinct, briefly salivates at the sound of a doorbell.

D

A dog, whose conditioned response has become extinct, briefly demonstrates a new conditioned response to the doorbell (wagging its tail).

E

A dog, which has been conditioned to salivate at the sound of a doorbell, begins to salivate to stimuli related to the doorbell, such as a finger extended to press the bell

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