In high school, janet rarely smoked or drank alcohol. in college, janet met some friend who spent most of their downtime consuming large amounts of alcohol and other drugs. soon, she did the same and did not know anyone who did not spend their time that way. which theory best explains janet's behavior, given this limited amount of information?

The correct answer should be theory of differential association.
According to this theory proposed by Edwin Sutherland, we tend to learn and adopt criminal behaviors by being around people who behave that particular way. So, in this case, Janet didn't use to smoke or drink, but when surrounded by people who did that, she adopted such behaviors over time.