8. Which of the following best describes the function of the blood-testis barrier? (A)It maintains a differential fluid composition of the seminiferous tubule lumen that facilitates development of sperm and protects sperm from the immune system. (B)It maintains a differential fluid composition of the seminiferous tubule lumen that facilitates the development of sperm and blocks the access of androgens to the lumen. (C) It maintains a differential fluid composition of the seminiferous tubule lumen that facilitates the entry of inhibin into the lumen, thereby decreasing sperm production. (D) It maintains a differential fluid composition of the epididymis tubule lumen that facilitates movement of sperm during emission. (E)It maintains a differential fluid composition of the epididymis tubule lumen that favors maintaining high concentrations of androgens in the lumen to facilitate sperm production.