Final answer:
Ingesting large amounts of water decreases blood osmolality, which in turn triggers a decrease in the secretion of antidiuretic hormone (ADH) to reduce water reabsorption in the kidneys. Therefore, the correct option is d.
Step-by-step explanation:
The hormone responsible for the regulation of water retention in the body is antidiuretic hormone (ADH). The secretion of ADH is largely dependent on blood osmolality levels; with dehydration or higher osmolarity, the secretion of ADH increases to retain water. Conversely, the ingestion of large amounts of water leads to a decrease in blood osmolality and, as a result, a decrease in ADH secretion to reduce water reabsorption in the kidneys and increase urine output. Therefore, the correct answer is d. ingesting large amounts of water, which will trigger a decrease in ADH.