The correct option is A Glycoprotein
Agglutinogens are glycoproteins present on the surface of red blood cells. Blood grouping is based on two types of agglutinogens that are responsible for the four types of blood groups- A, B, AB and O. A person with blood group A has A agglutinogen. A person with blood group B has B agglutinogen. A person with blood group AB has both A and B agglutinogens and a person with blood group O has neither A nor B agglutinogens. Thus the correct answer is option A.