The development of phobias can be partly explained by: A. high brain levels of dopamine. B. low brain levels of dopamine. C. the misinterpretation of the signs of normal physical arousal. D. classical conditioning, operant conditioning, and observational learning.

D) classical conditioning, operant conditioning, and observational learning.

Explanation:

It is unusual for a phobia to start after the age of 30 years, and most begin at the earliest times of ones life, the teenage years, or early adulthood. They can be triggered by a stressful experience, a frightening event, or a parent or household member with a phobia that a child can 'learn.