Research Has Suggested That a Factor Contributing to the Development

Research has suggested that a factor contributing to the development of some anxiety reactions is

A) operant conditioning and preparedness work against each other.
B) people apparently learn to avoid certain stimuli if they observe other people showing a strong fear response to those stimuli.
C) some people are more prepared than others for emotional events.
D) people need to experience emotional events themselves in order for it to affect their lives in future.