The answer choices to this question are:
a. Learned helplessness.
b. Stimulus discrimination.
c. Aversive conditioning.
d. Vicarious learning.
The best answer choice is:
a. Learned helplessness
Explanation: Learned helplessness was studied by Seligman as a potential animal model of depression. Learned helplessness occurs when people or animals feel helpless to avoid negative situations. Martin Seligman first observed learned helplessness when he was doing experiments on dogs. He noticed that the dogs didn't try to escape the shocks if they had been conditioned to believe that they couldn't escape.