If Velocity Were Constant,as Assumed by the Pre-Keynesian Version of the Quantity

If velocity were constant,as assumed by the pre-Keynesian version of the quantity theory,then a 10% change in the money supply would cause

A) a proportionate change in prices.
B) a proportionate change in output.
C) the sum of proportionate change in P and Y equals 10%.
D) the net difference of proportionate change in P and Y equals 10%.