The answer is B MacArthur wanted to become more aggressive and invade China. After China intervened in the Korean war when it was close to being finished MacArthur wanted to punish China by bombing and invasion to beat China in a war. Trumans policy was to just hold onto Korea and not engage Cina on land. At the time the US was worried about an invasion of Europe by the USSR and felt a war with China in asia was the wrong war at the wrong time.
They used dry farming and flood irrigation.
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A primary source is one that is written by someone who experienced the event firsthand. Anne Frank's diary is an example of a primary source. She was the first (primary) person who experienced what happened on that hierarchy.
A secondary source is one that is written about a primary source. It comes second on the hierarchy of receiving historical information because it has to be based on a primary source, which gives the actual information. A history documentary is an example of a secondary source.
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