Answer:
The use of money better than a barter system because of the following reasons: A person holding money can easily exchange it for any commodity or service that he or she might want. Thus everyone prefers to receive payments in money and then exchange the money for things that they want.
It allowed the United States to expand its territory by accepting California as a state. A territory rich in gold, agricultural products and other natural resources would create wealth and enrich the country as a whole.
I’m assuming your talking about world war 2 and if so the most likely answer is b since Germany at the time was in control of a large portion of Europe