To solve this problem, we need to analyze each statement and determine which are correct:$\newline \bullet$A. An excessive loss of body fluid from the body switches off osmoreceptors.$\newline$ - This statement is incorrect. Excessive loss of body fluid actually activates osmoreceptors, which in turn stimulate the release of ADH to conserve water.$\newline \bullet$B. ADH facilitates water reabsorption to prevent diuresis.$\newline$ - This statement is correct. ADH (antidiuretic hormone) increases the permeability of the kidney's collecting ducts to water, promoting water reabsorption and reducing urine output.$\newline \bullet$