The Rate Law of a Reaction Is Rate = K[D][X]

The rate law of a reaction is rate = k[D][X].The units of the rate constant are ________.

A) mol L^-1s^-1
B) L mol^-1s^-1
C) mol² L^-2s^-1
D) mol L^-1s^-2
E) L² mol^-2s^-1