Why would a America care about Soviet power in Europe

Many factors!

Explanation: A big concern was Communism, or the Socialists. This political party had a lot of influence, as their nation was, and is, rather large. After the Russian Revolution, the Socialists gained power under Vladamir Lenin. Russia was also a precious trading partner and their influence may have hindered this trade. Most big powers were concerned that Communism would spread to other nations and all over the world.

d and a is the correct anwsers

explanation:

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.