In 1973,the American Public Was Shocked to Learn That

In 1973,the American public was shocked to learn that

A) some American soldiers had committed massacres in Vietnam.
B) the Vietnamese peace agreement would not last.
C) the U.S. Air Force had been secretly bombing Cambodia since 1969.
D) President Nixon had prepared plans to invade North Vietnam.
E) the United States was threatening to use nuclear weapons in Vietnam and Cambodia.