Results of a Patients 24 -Hour Urine Sample Indicate Osmolality $510 \mathrm{mOsm} / \mathrm{kg}$

Results of a patients 24 -hour urine sample indicate osmolality of $510 \mathrm{mOsm} / \mathrm{kg}$ , which is within reference range. What conclusion can the nurse draw from this assessment finding?

A) The patients kidneys are capable of maintaining acidbase balance.
B) The patients kidneys reabsorb most of the potassium that the patient ingests.
C) The patients kidneys can produce sufficiently concentrated urine.
D) The patients kidneys are producing sufficient erythropoietin.