Countries Such as Bolivia and Costa Rica Have Adopted Crawling

Countries such as Bolivia and Costa Rica have adopted crawling pegged exchange rates.Under this system, a country

A) makes small, frequent changes in the par value of its currency to moderate balance of payments disequilibrium.
B) allows its currency to float freely in the foreign exchange market in the short run and long run.
C) maintains a system of completely fixed exchange rates.
D) smooths fluctuations in exchange rates over the long run, but not in the short run.