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It was the "Open Door Policy" that was the name of the trading policy that Secretary of State John Hay initiated with China and the European nations that already had a presence there, since the US wanted to benefit from trade with China as well.
If i were a US civilian living during World War II, the rationing of materials to support the war effort would be the government action that would have influenced my everyday life the most. The correct option in regards to the given question is option "D". Rationing of materials would definitely create a shortage of regularly needed materials in the market. This would be a hard thing to accept. Since we all live our daily life in a fixed pattern, it is difficult to adjust to any kind of curtails. This shortage can always lead to a higher rate for buying those restricted materials and thus my income could seem less than before as the cost of buying gets increased.
Pretty sure it's B because they gained support in the civil war