What does the illustration described below show about US policies during the Cold War?The illustration in which world communism is shown to be...

In order to answer this question, you first have to figure
out what this illustration shows.  It sounds like it is saying that communism is
threatening to take over the countries that you mention.  So then you need to figure out
which of the answer choices has to do with preventing the spread of communism.  The best
of the answers is B, though C would be a possibility as
well.

The Helsinki Accords and the SALT talks both had to
do with reducing tensions between the US and the Soviet Union and (in the case of the
Helsinki Accords) their respective allies.  Neither of those has anything to do with
preventing the spread of communism.

The Truman Doctrine is
the best choice because it represented the idea that the US would help any country that
was being threatened by communism.   The Marshall Plan was helpful in stopping
communism, but it was mostly directed at rebuilding Europe after WWII.  Therefore, the
Truman Doctrine is the best answer.