The answer is c they learned how to grow food and survive from the american indians
Generally speaking, a "mixed" economic system can be characterized by some government involvement and private ownership of most business, since some government regulation ensures the protection of the consumers.
A: He wanted to quickly end the war in the Pacific without invading.
Germany had surrender by this point in the war, and it was only Japan left, they didn't want to cause more casualties by a full-scale invasion, so they wanted to use the bombs in hopes to end the war for good.
This means that WW2 caused many things to be the way they are today, such as the racisim, the invisible line of subtle seperation between races and religions, etc.