Below Is a Fractional Saturation Curve for O₂ Binding to Adult

Below is a fractional saturation curve for O₂ binding to adult hemoglobin.Assume that curve Y represents a system at pH 7.4 and with a normal physiological level of 2,3-BPG.Curve X represents a system that

A) is at pH 7.4 with a higher than normal physiological level of 2,3-BPG.
B) has a higher pH with a normal physiological level of 2,3-BPG.
C) has a lower pH with a normal physiological level of 2,3-BPG.
D) is at pH 7.4 with a normal physiological level of 2,3-BPG but with an increased level of CO₂.