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Proxy means that something is done representing something or someone else. If you tell somebody to say hi to someone for you, they are saying hi to that other person in proxy for you.
Answer B talks about sending spies. This has nothing to do with proxy.
Answer C talks about getting more weapons. This doesn't have anything to do with representation.
Answer D talks about engaging in direct military conflicts. If the US and USSR armies were fighting each other, that would not be proxy because there is no one else representing them.
Answer A talks about supporting armies in conflicts around the world. In Korea, the USSR supported North Korea and the US supported South Korea. These two fought kind of on behalf of the USSR and US, so it is basically proxy. North Korea represented the USSR and South Korea represented the US.
Therefore, the answer is A. supporting armies in conflicts around the world.
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<span>Shifts </span>between<span> cautious cooperation and often bitter superpower rivalry over the years. </span>
It was "Igor Stravinsky" who <span>became an American citizen in 1940, due mostly to the fact that many Europeans were seeking refuge in the US during this time due to war in Europe. </span>
The idea that a proletarian revolution is needed is a cornerstone of Marxism; Marxists believe that the workers of the world must unite and free themselves from capitalist oppression to create a world run by and for the working class.
A. 1967/1968
The other answers weren't even during the time of the Vietnam Conflict, whereas Option A even coincides with protests close to Kent State in 1970.