Respuesta :
The correct answer is B. Marc.
Katrina is at risk of peer pressure because she is depressed however she has a support system through her older sister and this is a key factor in her chances of peer pressure being lowered.
Becky is at risk of substance abuse but she also has a good support system in her best friend and there is no peer pressure here to take drugs in fact it's the opposite.
Marc is the only one who has no support, his parents are away, he's just started a new school, he is finding it hard to make friends, he is highly vulnerable.