Which is an example of negative peer pressure?

A. You notice that most of your classmates are bringing their own healthy lunches to school instead of buying the school burgers, so you decide to do the same.
B. Your classmates laugh and poke fun at a boy with a speech impediment. When you won't join in, they start to tease you, as well.
C. Your friend joined the drama club because you wanted to, but since she really wants to be on the cheerleading squad, you encourage her to try out.
D. Your friends are all joining a weekend volunteer program in the community and encourage you come along with them.