Concept:Anti-diuretic hormone (ADH) makes the kidneys reabsorb water.Without it, the body loses too much water.Explanation:ADH normally reduces urine output by increasing water reabsorption in the kidney tubules.When ADH is absent, the kidney tubules do not reabsorb enough water.This causes the body to pass large volumes of dilute urine.The result is excessive water loss and rapid reduction of body fluids.This condition therefore leads to severe or drastic dehydration.Answer:B. drastic dehydration