When the level of adh (antidiuretic hormone) decreases
a) more urine is produced
b) less urine is produced
c) the osmolarity of the urine decreases
d) both a and c
e) both b and c

(A). more urine is produced.

Explanation:

ADH (antidiuretic hormone), also known as vasopressin is a peptide hormone, which is synthezied in hypothalamus and is secreted by posterior pituitary gland.  

ADH plays role in osmoregulation as it is responsible for water retention by decreasing urine output when there is low level of water in body.

As ADH is responsible for decreased urine formation, more urine will be produced due to decrease in ADH that would lead to an increase osmolarity of urine.  

Thus, the correct answer is option (A).

i think that c)gold was found there

but i am not sure