which caught the united states by surprise in 1968, in the midst of the vietnam war?\nthe tet offensive…

which caught the united states by surprise in 1968, in the midst of the vietnam war?\nthe tet offensive attacks\nthe gulf of tonkin incident\nthe use of agent orange\nthe overthrow of president diem
Answer
Brief Explanations:
The Tet Offensive was a major military campaign during the Vietnam War. It was launched by the Viet Cong and North Vietnamese forces against South Vietnamese and U.S. forces. The timing (during the Tet holiday, a time when a cease - fire was expected) and the scale of the attacks caught the U.S. by surprise. The Gulf of Tonkin incident was in 1964. Agent Orange was a chemical used throughout the war but its use was not a single event that caught the U.S. by surprise in 1968. The overthrow of President Diem was in 1963.
Answer:
the Tet Offensive attacks