I'd go with (B) containment. They wanted to contain communism by
building up an alliance of friends around the world to "box in"
communist influence or countries that fell under their control.
The other answers don't make much sense - at least not yet. Detente
happened much later under Nixon and Ford, a kind of thawing period
between the US and the Soviets. Massive retaliation was the military
policy at the time, not their foreign policy, and democratic enlargement
is something associated with President Clinton.
