Money allows people to trade goods and services indirectly. In a barter economy, a buyer must find a seller in search of the exact goods that he/she has to offer. With the gold standard, the money supply would be tied to the amount of gold the country possessed, and a restricted money supply could impede economic growth.
I would say A because that would be the obvious but if there is a certain lesson on like how England became rich from Christopher or something like that then I would choose the one that you are learning about. A would be my answer.
