Which of the Following Reversible Reactions of Carbon Dioxide Explains

Multiple Choice

Which of the following reversible reactions of carbon dioxide explains how hemoglobin serves as a transporter of carbon dioxide?

A) reaction with the imidazole group of the distal histidine where oxygen would normally be bound
B) reaction with the carboxyl group of glutamic acid to form a carbonic acid anhydride
C) reaction with the N-terminal amino groups to form a carbamate
D) reaction with the hydroxyl group of serine to form a carbonate
E) none of the above