Central banks control exchange rates by intervention. If a nation such as Japan wished to peg its market rate at a certain level, such as 100 = $1, what should it do if the actual market rate begins to depreciate to 125 = $1?

a	It should increase its GDP to increase exports.
b	It should purchase dollars with its own currency.
c	It should sell dollars from its treasury and retire its own currency.
d	It should petition the IMF for a rate change.