15. Which statement best describes the function of fibrinogen? - (A) It transports lipids, playing a role in clotting and defending the body against foreign substances. - (B) It primarily affects the movement of fluid into capillaries by creating an osmotic gradient. - (C) It provides the nutrients needed to replicate erythrocytes. - (D) It is the key substance in the formation of blood clots. - (E) It aids in the structural form of the erythrocyte.