Rats that received unpredictable electric shocks in a laboratory experiment subsequently became apprehensive when returned to that same laboratory setting. this best illustrates that anxiety may result from:
a. repression.
b. cognition.
c. conditioning.
d. reinforcement.

Answer is C. conditioning.

Explanation:

Conditioning in anxiety disorder means someone or something became apprehensive when entering a setting known to be a threat, because of what has been learnt before or experienced had.

The rat became apprehensive because it recognized the laboratory settings or environment as a threat , based on what it has passed through or experienced before.

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