The correct option is B RBC
Blood group antigens (Rh as well as ABO) are either sugar or proteins, and they are attached to various components in red blood cell membranes.
White blood cells and platelets also express a variety of antigens but their expression is not responsible for Rh and ABO blood group.
Plasma contains the antibodies. Antibody is a protein produced by the immune system in response to the presence of a foreign substance called antigen.