The correct answer is D. It changed the minds of many war supporters in the United States
Step-by-step explanation
During the Vietnam War, the North Vietnamese Communist Army planned an offensive to weaken the South Vietnamese Army and achieve victory much faster. This military plan is known as "the Tet offensive" that was carried out in 1968, however, the results were not as expected since the effects on the enemy army were not as expected. This plan had a consequence on the American population because the United States Army and the government had campaigned in support of the Vietnam War and the population was deceived into believing that they were close to victory, but once This attack occurred, the confidence of the people in the army decreased and they though that all was a lie, so the support for this intervention declined quickly. So, the correct answer is D. It changed the minds of many war supporters in the United States