An Examination of Revised Money Supply Statistics,when Compared to the Initial

An examination of revised money supply statistics,when compared to the initial statistics,suggests that the initial statistics

A) are pretty good.
B) do not provide a good guide to short-run movements in the money supply.
C) provide a poor guide of monetary policy because they are usually underestimates of the revised statistics.
D) provide a good guide of monetary policy,though they are usually underestimates of the revised statistics.