Carbon Monoxide Is a Colorless and Odorless Gas That

Carbon monoxide is a colorless and odorless gas that

A) binds weakly to amino acids in hemoglobin.
B) binds to the heme group of hemoglobin.
C) binds more strongly to the heme than oxygen does.
D) both binds weakly to amino acids in hemoglobin and binds to the heme group of hemoglobin.
E) both binds to the heme group of hemoglobin and binds more strongly to the heme than oxygen does.