Explain how velocity varies with changes in R and in Y. (Hint: The effect of output changes on V depends on the elasticity of aggregate money demand with respect to real output, which economists believe to be less than unity.) A. An increase in R will increase velocity, while an increase in Y will decrease velocity. O B. An increase in R will increase velocity, while an increase in Y will leave it unchanged, O C. An increase in either R or Y will increase velocity. O D. An increase in either R or Y will decrease velocity