The correct option is C Diuresis
Alcohol inhibits the pituitary secretion of the anti-diuretic hormone or ADH, which acts on the kidney to reabsorb water. Alcohol acts on the hypothalamus / pituitary to reduce the circulating levels of ADH. When ADH levels drop, the kidneys do not reabsorb as much water; consequently the kidneys produce more urine, thereby causing diuresis.
Thus, the correct answer is option (C)