The theorist who conducted an experiment in which a rat was conditioned to press a bar in order to receive a reward, illustrating how nurture influences behavior include option D: "B. F. Skinner."
Burrhus Frederic Skinner was an famous American psychologist and writer. He also known as the best professor of Harvard University from 1958 to 1974.
Skinner describe this experiment in a operant conditioning. Through this experiment, Skinner wants to know about the behavior of particular rat when the hungry rat put into the box and the rat try to moved out from the box along with by mistake knock the lever.
Therefore, correct option is D.
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