Why Is Tact a Common Response in Potentially Embarrassing Situations

Why is tact a common response in potentially embarrassing situations?

A) Because the audience doesn't like to see people make fools of themselves.
B) Because show business etiquette dictates that the person on stage be shown deference.
C) Because embarrassment provokes discomfort for everyone.
D) Because we don't want to face the reality of failures.
E) Because we want to maintain our power.