Consider That Britain Is Trying to Maintain a Fixed Exchange

Consider that Britain is trying to maintain a fixed exchange rate with respect to the U.S. dollar. However, the present situation in the foreign exchange market is conducive for the British pound to depreciate with respect to the U.S. dollar. The British government can only intervene in the foreign exchange market for a limited period of time because:

A) the British government will eventually run out of pounds.
B) the British inflation rate will eventually rise so much that the government will give up their defense of the pegged rate.
C) the British government will end up with too many dollars in their central bank.
D) the British government will run out of official international reserves.