How Is the Rate of an Enzyme Catalyzed Reaction Affected

How is the rate of an enzyme catalyzed reaction affected by increasing enzyme concentration?

A) The rate increases directly as the concentration of enzyme increases with excess substrate.
B) The rate decreases directly as the concentration of enzyme increases.
C) The rate initially increases as the concentration of enzyme increases,but then remains constant in spite of increasing amount of enzyme.
D) The rate initially increases as the concentration of enzyme increases,but then decreases once the concentration of enzyme passes an optimum level.
E) none of the above