People are less likely to give aid if an emergency occurs in the presence of many observers.This is known as

A) altruism.
B) social exchange theory.
C) the bystander effect.
D) the mere exposure effect.

Bystander Effect

A social psychological phenomenon where individuals are less likely to offer help to a victim when other people are present, often due to the diffusion of responsibility.

Altruism

The selfless concern for the well-being of others, characterized by acts intended to benefit or help someone without expecting anything in return.

Social Exchange Theory

A theory in social psychology that suggests human relationships are formed by the use of a subjective cost-benefit analysis and the comparison of alternatives.