Answer: To avoid unfamiliar and possibly dangerous stimuli.
Step-by-step explanation:
The mere exposure effect is a psychological phenomenon by which we usually reveal an inclination for things simply because they are known to us. It refers to a situation in which a certain stimulus has been available to a subject’s perception, either consciously or subconsciously.
It was first proven by the Polish-born psychologist Robert Zajonc, who performed a seminal experiment in 1968.