Read the following statements carefully with respect to the coagulation of blood and choose the option that depicts the two incorrect ones:

(A) An enzyme complex thrombokinase is required for the conversion of prothrombin into thrombin.

(B) An injury stimulates RBCs in the blood to release certain factors which activate the mechanism of coagulation.

(C) $K^{+}$ ions play a very important role in clotting.

(D) Thrombin helps in the formation of fibrin from fibrinogen.