The United States. During the Korean War, the United States was a major ally and had a major role in the war. Yes there were other allies, but the Untied States was the biggest. To this day, the United States is still in South Korea and still the largest ally that they have.
B or c but imma go with state
B) Taxation without representation.
Taxation in the colonies was a huge issue. One of the major events leading up to the Revolutionary War was the Boston Tea Party and that was caused by high taxes.