Which Statement Below Regarding Reaction Mechanisms Is FALSE

Which statement below regarding reaction mechanisms is FALSE?

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.