Exhibit 12-1 the Following Question(s) Relate to the Reaction Between

Exhibit 12-1 The following question(s) relate to the reaction between water and a complex ion of Co²⁺; the rate varies with concentration as follows. (The rate has no dependence on [H₂O].)
Refer to Exhibit 12-1. The rate law for the reaction is rate =

A) k²[Co²⁺ complex].
B) k[Co²⁺ complex].
C) 2k[Co²⁺ complex].
D) k[Co²⁺ complex]/2.
E) k[Co²⁺ complex]².