According to the U.S.National Academies of Sciences,Engineering,and Medicine,the use of ________ is predictive of increased risk of social anxiety disorder and suicidal thoughts.

A) alcohol
B) morphine
C) marijuana
D) heroin

The U.S. National Academies of Sciences, Engineering, and Medicine have stated that the use of marijuana is predictive of increased risk of social anxiety disorder and suicidal thoughts. This conclusion was drawn from a review of numerous studies on the effects of marijuana on mental health. Alcohol, morphine, and heroin may also have negative effects on mental health, but the question specifically asks for which substance is predictive of these specific mental health risks.