Which of the Following Is an Advantage of a Free-Floating

Which of the following is an advantage of a free-floating exchange rate system?

A) A free-floating exchange rate acts as a buffer to insulate an economy from the impact of international events.
B) Under a system of free-floating exchange rates, a nation will, over the long run, experience more surpluses than deficits in its balance of payments.
C) Fluctuating exchange rates reduces the risk involved in international transactions riskier and thus lower the cost of doing business with other countries.
D) A free-floating exchange rate system improves the effectiveness of a country's monetary policy and promotes price stability.