Answer:Diffusion of responsibility
Step-by-step explanation
Diffusion of responsibility refers to a psychological phenomenon in which we tend to pull back and not help someone in a critical situation or any situation , just because there are other people around and we feel like someone else amongst these other individuals will do it.
Diffusion of responsibility lead to bystander effect where everyone stand and hope that someone else will help other than themselves.
We feel less pressured to help if there are many other people around.