Which Statement Is NOT Correct Concerning 2,3-Bisphosphoglycerate (BPG)

Which statement is NOT correct concerning 2,3-bisphosphoglycerate (BPG) ?

A) It binds at a distance from the heme groups of hemoglobin.
B) It binds with lower affinity to fetal hemoglobin than to adult hemoglobin.
C) It increases the affinity of hemoglobin for oxygen.
D) It is an allosteric modulator.
E) It is normally found associated with the hemoglobin extracted from red blood cells.