Analyze how the structural differences between fetal and adult hemoglobin lead to functional outcomes in oxygen transport.

• A. Beta subunits in adult hemoglobin reduce BPG binding, enhancing oxygen transport efficiency.
• B. Gamma subunits in fetal hemoglobin reduce BPG binding, enhancing oxygen transport efficiency.
• C. Beta subunits in adult hemoglobin increase BPG binding, reducing oxygen transport efficiency.
• D. Gamma subunits in fetal hemoglobin increase BPG binding, reducing oxygen transport efficiency.

Answer: (B)