69. How do ADH and RAAS work together in maintaining osmoregulatory homeostasis? (A) ADH monitors appropriate osmolarity by reabsorption of water, and RAAS maintains osmolarity by stimulating K+ reabsorption. (B) ADH monitors appropriate osmolarity by reabsorption of water, and RAAS maintains osmolarity by stimulating Cl－ reabsorption. (C) Only when they are together in the receptor sites of proximal tubule cells, will reabsorption of essential nutrients back into the blood take place. (D) ADH monitors appropriate osmolarity by reabsorption of water, and RAAS maintains osmolarity by stimulating Na+ reabsorption. (E) ADH and RAAS work antagonistically; ADH stimulates water reabsorption during dehydration and RAAS removes water when it is in excess in body fluids.