Why Does the Rally-Round-The-Flag Effect Occur

Why does the rally-round-the-flag effect occur?

A) Members of a group feel greater loyalty when they come into conflict with outsiders.
B) Individuals feel a greater sense of community at mass political rallies.
C) Average citizens feel that their leaders in government will finally hear their collective voice.
D) Citizens usually want to help protect people who share ethnic and historical ties with their country.
E) A leader knows starting a war will prove to the public that he or she is a loyal and responsible leader.