Who is more likely to give in to peer pressure and start substance abuse?

1.Katrina, who has been feeling depressed and upset lately but can discuss her problems with her older sister
2.Marc, who just joined a new school and is finding it hard to make friends, especially because his parents are away a lot
3.Becky, who saw her favorite actor taking cocaine in a movie and thinks it's cool. Her best friend disagrees and warns her not to copy him.