19. The experimental rate law for the decomposition of nitrous oxide (N2O) to N2 and O2 is Rate = k[N2O]2. Two mechanisms are proposed: I: N2O → N2 + O N2O + O → N2 + O2 II: 2N2O → N4O2 N4O2→ 2N2 + O2 Which of the following could be a correct mechanism? (A) mechanism I with the first step as the rate-determining step (B) mechanism I with the second step as the rate-determining step (C) mechanism II with the second step as the rate-determining step (D) two of these could be correct (E) none of these could be correct.