The correct option is A Fibrin and corpuscles
Blood is composed of plasma and several kinds of cells. These blood cells consist of erythrocytes (red blood cells), leukocytes (white blood cells) and thrombocytes (platelets). Thrombocytes are blood cells, which along with the coagulation factors, fibrin take part in blood clotting (coagulation) by creating a mesh, through which blood cells can not pass.