15. Suppose that inflation is at the target rate and output has fallen substantially below potential output. Acentral bank with a primary objective of price stability should ________.
(A) do nothing, because inflation cannot rise when unemployment is high
(B) ease monetary policy, to avoid a decrease in the inflation rate
(C) do nothing, because stabilizing economic activity is not a primary objective
(D) ease monetary policy, because avoiding high unemployment is more important than avoiding highinflation