Agglutinins are surface antigens on RBCs. contain abundant stained "granules." prevent blood clotting. are antibodies that will attack surface antigens on RBCs of a different blood type. are substances that can trigger a protective defense mechanism called an immune response.

The preferable statement will be - 4. (D)

D. Agglutinins are antibodies that will attack surface antigens on RBCs of a different blood type.

Explanation:

An agglutinin is a type of antibody protein present in the blood and it binds with the foreign agglutinins or antigens. Those foreign antigens stimulate the body to make agglutinins. The agglutinins plays a key role in blood typing, aggregation, and coagulation.