A Solution of Equal Amounts of Hemoglobin and Myoglobin Is

A solution of equal amounts of hemoglobin and myoglobin is maintained at a very low partial pressure of oxygen, so that both proteins exist predominantly in the deoxygenated form.What happens when the solution is then bubbled with a small amount of oxygen?

A) Myoglobin undergoes a conformational change that raises its oxygen affinity above that of hemoglobin.
B) 2,3-BPG dissociates from hemoglobin and binds to myoglobin.
C) Much more of the dissolved oxygen binds to myoglobin than to hemoglobin.
D) Hemoglobin dissociates into its subunits.
E) Most hemoglobin becomes oxygenated, whereas most myoglobin remains deoxygenated.