The answer is option c. When the blood becomes dilute, ADH is no longer released from the hypothalamus.
Explanation:
Negative feedback mechanisms makes use of one of the end product of a pathway to control the activity of the pathway and reduce the release of the product.
Antiduiretic hormone (ADH) is produced in the hypothalamus. ADH regulates the amount of water in the blood. When there is less water in the blood, this stimulates the hypothalamus to release ADH so as to conserve water. When the blood becomes dilute (end product), as in the example, ADH release is stopped by the hypothalamus to prevent further dilution of the blood.
