Should the government prevent beta's domination of the market so that there are other places where people can buy the things they want?

I don't know what BETA is but yes absolutely. Competition is always better for consumers or you end up with what happened with the airlines or cable networks. Three or four companies that peacefully coexist, meaning higher prices and a worse product.

d.prevent the spread of communism outside of eastern europe.

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.