In a Heterogeneous Chemical Reaction Requiring the Use of a Solid

Multiple Choice

In a heterogeneous chemical reaction requiring the use of a solid catalyst, the rate of the reaction could not be increased by increasing the concentration of reactants, but was doubled by doubling the amount of solid catalyst added. This probably indicated that

A) a minimum amount of catalyst was required to make the catalyst active
B) the active sites on the initial amount of catalyst were fully saturated
C) catalysts should be considered as just another chemical reactant
D) the catalyst actually does not have any effect on the rate of this reaction at all
E) all of these