Soldiers returning to the united states who used high-quality while in vietnam discontinued use when they were no longer confronted by the anxiety and depression of the war experience.
a. cocaineb. marijuanac. alcohold. heroin

d. heroin

Explanation:

In the early 1970's, there was argued to be a distinctive heroin problem among  American troops in Vietnam.  

It was discovered that there were heroin addicts from over 15 percent of  American troops deployed there.  

The finding resulted in a burst of activity, including the establishment of  President Nixon's Special Action Office for Drug Abuse Prevention,  promoting prevention and recovery, and tracking addicted military members back  home.

intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.

answer; caravan;