According to Chapter 11, what is a reason behavioral models (i.e., someone who demonstrates helping behavior) tend to increase helping among others?

A) Models make people feel guilty if they do not also help
B) Observing a behavioral model tends to put people in a good mood, so they are more willing to help
C) Models demonstrate that the benefits of helping outweigh the costs
D) Observing a behavioral model creates a diffusion of responsibility

Behavioral models demonstrate that the benefits of helping outweigh the costs, which can increase helping behavior among others. Seeing someone else help successfully can also serve as a social proof that helping is the right thing to do. Guilt and diffusion of responsibility are not mentioned as reasons why behavioral models tend to increase helping behavior. While observing a behavioral model can put people in a good mood, this is not the primary reason why behavioral models increase helping behavior.