What is the primary mechanism by which hemoglobin protects itself from oxidative damage?

A Binding of antioxidants to the globin chain
B Conversion of methemoglobin to hemoglobin
C Binding of carbon monoxide to the heme group
D Presence of a scavenging system for reactive oxygen species
Hemoglobin has a scavenging system for reactive oxygen species, which protects it from oxidative damage.
Biochemistry textbooks
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Medium MEDICAL Confidence: high