What was the main political issue at the center of the counter culture movement of the 1960s

I would say B.

Explanation:

Around the 1960s the Vietnam War and the US' involvement in it created a lot of upstir with US citizens. Lots of protests and divide was caused because of it at the time.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.