Under Fixed Exchange Rates, a Central Bank

Under fixed exchange rates, a central bank

A) adjusts the money supply automatically and immediately to changes in the demand and supply of foreign exchange
B) need hold no reserves of foreign exchange
C) enforces the fixed exchange rate by refusing to buy or sell foreign exchange whenever changes occur in demand or supply
D) may find its reserves fluctuating as demand and supply conditions change
E) has no authority to buy or sell foreign exchange