Human Beings Generally Have an Aversion to Bitter and Sour

Human beings generally have an aversion to bitter and sour foods. Some researchers suggest that this is because foods that are inedible or even poisonous are often bitter or sour. The tendency of human beings to find these potentially harmful foods repulsive is an example of

A) classical conditioning.
B) vicarious conditioning.
C) a conditioned emotional response.
D) a biological predisposition.
E) an instinctive drift.

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