Final answer:
The group wanting the U.S. to exit Vietnam were the doves, which included organizations like the SDS and gained support following the Tet Offensive. Option 4.
Step-by-step explanation:
Those who wanted the United States to withdraw from Vietnam were known as the doves. This group was characterized by their strong opposition to the war, and by the year 1967, they had formed a significant antiwar movement.
The students for a Democratic Society, or SDS, were a notable part of this movement and were part of what came to be known as the New Left.
Meanwhile, the Tet Offensive significantly impacted public opinion on the war, as it showcased the Viet Cong's resilience and caused many Americans to doubt the war effort, thus bolstering the doves' argument for withdrawal.
The hawks, on the other hand, believed that American military force was necessary to end the war and supported increasing troop strength and intensifying bombing campaigns.
General William Westmoreland was an example of a hawk, as he saw the war's failure attributed to protestors weakening the resolve of the American home front rather than military strategy or the war's legitimacy.
So Option 4 is correct.