Answer:
The first one
<h2><em>
Mark began abusing narcotic drugs once he started hanging around with Josh</em></h2>
Explanation:
Trafficking occurs due to several reasons. For this scenario, the question is already giving us a hint to what answer should be selected. Notice how it says 'who is likely to be vulnerable to trafficking because of drug or alcohol
dependence?'
Next, look at all the answers of the multiple choice. The answers 'Tammy and her boyfriend tried drinking beer one time at a party.' and 'Mark began abusing narcotic drugs once he started hanging around with Josh.' look very promising.
These two answers are related to the question being asked. Drugs and alcohol is mentioned. But let's dive a little deeper. Notice how the definition of trafficking is <em><u>'deal or trade in something illegal.'</u></em>
Tammy and her boyfriend are not doing anything illegal by drinking beer at a party. (Unless under-aged). But even then they are not dealing or trading anything illegal. However Mark and his friend Josh are abusing narcotic drugs which are illegal. They are most likely to end up in dealing or trading narcotics to others.
<h3>
TIP: <em>Rule out all the answers that least make sense</em></h3>
