Which of the Following Statements Regarding Reaction Mechanisms Is NOT

Which of the following statements regarding reaction mechanisms is NOT true?

A) A valid reaction mechanism must be consistent with the stoichiometry of the rate-determining step.
B) Proposed elementary steps must be reasonable.
C) A valid reaction mechanism must be consistent with the stoichiometry of the reaction.
D) Valid mechanisms may have more than one transition state.
E) The proposed mechanism must be consistent with the experimentally observed rate law.