Why was the Tet Offensive a turning point in the war?

The Tet Offensive was a major series of attacks by North Vietnamese and Viet Cong forces in 1968. Although they did not achieve a lasting military victory, the attacks contradicted US officials’ claims that the war was nearly won, leading many Americans to lose confidence in the war effort. Vietnamization began later, in 1969, so D is not the reason Tet was a turning point.

AI-written and checked against the verified answer.