A major reason why people won't help when there are many bystanders is because:

A) of diffusion of responsibility.
B) people are egoistic.
C) people like to see others hurt.
D) people are not altruistic.

Diffusion of Responsibility

A sociopsychological phenomenon where individuals are less likely to take action or feel a sense of responsibility in the presence of a large group of people.

Bystanders

Individuals who are present at an event or incident but do not take part.