The correct option is
B Collecting tubule
ADH (Antidiuretic hormone) is also known as Vasopressin. It is a peptide hormone secreted from posterior lobe of pituitary gland. Antidiuretic hormone decreases rate of urine formation by stimulating water reabsorption in the kidneys. It acts on collecting ducts of nephrons to reabsorb water from the glomerular filtrate. Deficiency of ADH causes diabetes insipidus which is characterized by excessive urination and thirst.
So, the correct answer is 'Collecting tubule'.