The u. s. national institute of mental health has indicated that the development of adhd is a consequence of

I believe the answer is: genetic influences.
The united states national institute derived to this conclusion because from about 20 twin studies, they found that about 80% of ADHD case derived from genetic influences. This indicates that ADHD is just almost transferable through genetic as physical traits such as hair or eye color.

Any answer choices that would me answer your question?