40. The usual form of the experimental rate law for substitution in square planar Pt(I) complexes contains two terms: Rate =k1[PtL3X] + k2[PtL3X][Y] where PtL3X is the starting complex and Y is the entering group. The reason for the two-term law is that:
(A) there are competitive associative and dissociative pathways
(B) there are two competing dissociative pathways
(C) the solvent enters in the rate-determining step, and then two competing fast steps follow
(D) the solvent competes with Y in the rate-determining step