I believe answer D is correct
Answer:
Pulled
Explanation:
Their idiotic beliefs are getting them pushed, so really it is their own fault (don't report me, everyone has a right to their opinion, and 1st amendment ya'll)
The main reason why United States was involved in Vietnam is that the United States believed in the so called Domino effect: that if one country becomes communist, others might become communist too. So they got involved to stop the spread of communism (option a)
The answer is reciprocal gene-environment.
The reciprocal gene-environment model claims that people with a genetic predisposition to a disorder may also have a genetic tendency to create environmental risk factors that promote the disorder.