Most of the Carbon Dioxide Carried in the Blood from the Tissues

Most of the carbon dioxide carried in the blood from the tissues to the lungs is in what form?

A) carbonic acid,H₂CO₃
B) CO₂ dissolved in the blood
C) CO₂ bound to the N-terminal end of hemoglobin chains
D) CO₂ bound to the C-terminal end of the hemoglobin chains
E) as the bicarbonate ion dissolved in the blood