@auscandoc High Urine Osmolality means that the kidneys are responding to the ADH and that the levels of the ADH is high. So her answer is correct

@auscandoc it is actually a tricky question

@auscandoc there are 2 groups of answers here and a singleton. The first group of answers effectively says reduced aldosterone action, the second one says reduced ADH effect and the singleton increased ADH

@auscandoc if the first group was correct ie a form of hypoaldosteronism , then the K would be high , not low. If ADH was not working or not being secreted, the urine osmolality would be low.
The grouping of questions means there are only 3 answers. But one cannot select an answer in any of the 2 groups as correct and label the other one as incorrect. So both answers in both groups are incorrect, leaving the singleton as the only correct answer. The question maker is either a fool or a genius.