The correct answer is C, their limited feelings of responsibility. Social psychologists John Darley and Bibb Latane have introduced the concept of the bystander effect. This is a term describing how the presence of others can discourage someone from intervening in an emergency. It is based on the sociopsychological phenomenon of the diffusion of responsibility and how a person is less likely to take responsibility for an action or inaction when others are present. This leads to the individual transferring the responsibility of acting on the rest of the group.