All of the Following Are Characteristics of Hemoglobin's Binding of Oxygen

All of the following are characteristics of hemoglobin's binding of oxygen EXCEPT:

A) CO₂ promotes dissociation of O₂ from hemoglobin by lowering the pH.
B) Protons promote binding of oxygen by Hb.
C) 2,3-Bisphosphoglycerate (BPG) promotes release of O₂ by Hb.
D) CO₂ can bind with Hb's free amino groups and stabilize deoxy-Hb.
E) BPG and O₂ are mutually exclusive allosteric effectors of Hb.