Answer:
D. The U.S. military suffered a major strategic blow in the Tet Offensive.
Step-by-step explanation:
The Tet Offensive is what a series of attacks on more thatn 100 cities on south vietnam by North Vietnam that aimed to make the american troops leave the war, these series of attacks were held off by vietnamese and american soldiers, but the media coverage in the States and other parts of the word changed the public opinion and made the war very unpopular, the Tet offensive was a turning point in the Vietnam war, this begun the slow and long withdrawal of american forces from Vietnam.