Which of the Following Statements Concerning General-Acid Catalysis Is Correct

Which of the following statements concerning general-acid catalysis is correct?

A) The proton is transferred to the reactant during the slow step of the reaction.
B) The transition state of the slow step of the reaction has a partially transferred proton instead of a fully transferred proton.
C) Typically,a general-acid catalyst is stronger than a specific-acid catalyst.
D) both A and B
E) all of the above