If Central Bank a Cares Only About Keeping the Price

Multiple Choice

If Central Bank A cares only about keeping the price level stable and Central Bank B cares only about keeping output at its natural level, then in response to an exogenous decrease in the velocity of money:

A) both Central Bank A and Central Bank B should increase the quantity of money.
B) Central Bank A should increase the quantity of money whereas Central Bank B should keep it stable.
C) Central Bank A should keep the quantity of money stable whereas Central Bank B should increase it.
D) both Central Bank A and Central Bank B should keep the quantity of money stable.