Since 1978,the Bank of Japan Has Used an Interest Rate

Since 1978,the Bank of Japan has used an interest rate as its daily operating target ________.

A) providing additional evidence that interest rate smoothing is inconsistent with reducing inflation
B) because money growth in Japan is very volatile
C) with very good success, suggesting that an interest rate operating target is not necessarily a barrier to successful monetary policy
D) Only A and C of the above.