In Real Emergencies, Which of the Following Statements Is TRUE

In real emergencies, which of the following statements is TRUE?

A) In an emergency, people often underestimate the need for action because each person attempts to appear calm.
B) In an emergency, people often overestimate the need for action because they fear it to be a "life-or-death" situation.
C) In an emergency, people are more likely to get involved when there are more people present to help.
D) In emergencies, help is encouraged by a diffusion of responsibility.