If adh levels decrease or if adh is bound by something in your body, you would expect that:

Explanation:

Anti-diuretic hormone or ADH is the hormone produced by the posterior part of the pituitary glands when the osmoreceptors sense the low level of water in the body.

The ADH once released binds to the ADH receptors in the collecting tubules which are usually permeable to water. ADH causes the opening of the aquaporins II in the collecting tubules which causes the reabsorption of water back in the blood.  

If ADH amount decreases then the water is nor re-absorbed in the tubules and thus is excreted out with the urine causing the production of increased concentration of urine.

Thus, Amount of urine and plasma osmolarity increases is the correct answer.

c is the correct answer hope this !