Ramona was in a crowd of fellow students when she saw a maintenance worker fall down a flight of stairs at the entrance to a building. ramona continued on to her class without the worker. ramona's behavior reflects

Ramona's behavior reflects diffusion of responsibility.
This term refers to the fact that individuals are less likely to do something and offer somebody help if they are located in large crowds. If they are surrounded by other people who are also not doing anything to help, these individuals are unlikely to do something about the problem either because they are hoping someone else will do it for them.