Please Use the Following Information to Answer the Questions Below

Multiple Choice

Please use the following information to answer the questions below.
In the Himalayas,Mount Everest,Earth's highest mountain,reaches over 8,800 meters at its peak.At this altitude the atmospheric pressure is only 254 mm Hg.Although humans cannot survive at this altitude,the bar-headed goose can fly there without any problems.Bar-headed goose hemoglobin can bind the same number of oxygen molecules as human hemoglobin,but its affinities for binding oxygen are different (see graph below) .

-What is the maximum number of molecules of oxygen that bar-headed goose hemoglobin can bind to?

A) 1
B) 2
C) 3
D) 4