Answer:
a. water retention
Explanation:
Antidiuretic hormone stimulates water reabsorbtion by stimulating insertion of "water channels" or aquaporins into the membranes of kidney tubules. These channels transport solute-free water through tubular cells and back into blood, leading to a decrease in plasma osmolarity and an increase osmolarity of urine.
Or in simpler terms, The primary purpose of ADH (antidiuretic hormone) is to promote water retention in the body by decreasing the amount of water lost through urine.
Learn more about ADH here: brainly.com/question/28238913
