Blood Type Is Determined by Proteins

Blood type is determined by proteins. Blood type A has a different protein than blood type B. Blood type AB has both types of proteins and type O does not have either type of protein. When blood is transfused, the recipient's immune system will detect any new or foreign proteins. The blood type proteins must be located

A) in the red blood cell nucleus.
B) inside the red blood cell cytoplasm.
C) on the outer surface of the red blood cell membrane.
D) in the nuclear membrane.
E) in the endoplasmic reticulum of the red blood cells.