Monetarists Have Argued That Since Velocity __________, This Shows That

Monetarists have argued that since velocity __________, this shows that shifts to the investment demand function must __________.

A) is rather stable; cause the private economy to be unstable
B) is rather stable; be offset by interest rate changes
C) moves counter-cyclically; cause the private economy to be unstable
D) moves counter-cyclically; be offset by interest rate changes