The correct option is D agglutination
The process that occurs if an antigen of a blood group is mixed with its corresponding antibody is called agglutination. When blood transfusion occurs between people of wrong blood groups then RBC forms clumps and sticks together causing them to agglutinate.
Blood coagulation, or clotting, is the process of converting blood into a semisolid jelly-like substance.
In immunology, precipitation is the antigen antibody reaction where the antibody reacts with the antigen to form insoluble compound known as precipitate.
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.