The "Vietnam Syndrome" Refers to the Fear That

The "Vietnam syndrome" refers to the fear that

A) an international concern would bring about domestic unrest.
B) America should not act alone, lest its international reputation be diminished.
C) appeasement would backfire, resulting in a further international setback.
D) communism would take hold in small, undeveloped countries.
E) new conflicts could become long, bloody, and futile.