In the 1960s, american opposition to the vietnam war increased as more us troops went to fight in vietnam. decreased as more us troops went to fight in vietnam. was considered procommunist, so few people embraced it. was considered anticommunist, so many people embraced it.

The best answer is increased as more US troops went to fight in Vietnam.

LBJ's policy of "escalation", sending more troops and resources into Vietnam, started to quickly shift public opinion against the US presence in Vietnam. Although initially considered unpatriotic to protest the war, gradually more and more Americans began to oppose the war. 

Idon't think any of em are right, you need to add the number of what paragraph you got your citation from