Two Mechanisms Are Proposed: I

Two mechanisms are proposed: I. II. Which mechanism and which step as the rate determining step would best fit the data?

A) Mechanism I,with the first step the rate determining step.
B) Mechanism I,with the second step the rate determining step.
C) Mechanism II,with the first step rate determining.
D) Mechanism II,with the second step rate determining.
E) None of the above could be correct.