X + Y = Z is an equilibrium reaction. The addition of a catalyst?

A. increase the amount of Z produced in a given time
B. increases the rate of change in concentrations of X, Y and Z  
C. increases the rate of disapearance of X and Y
D. increases the rate of the forward reaction
E. decreases the amounts of X and Y left after the attainment of equilibrium

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Correct Answer: B