Which of the following describes the role of urinary systems in maintaining cellular homeostasis?

A. Urinary systems regulate water balance, pH, and the concentrations of ions in body fluids for cells.

B. Urinary systems are important for the generation of urea, which cells can use as an energy source when carbohydrates become scarce.

C. Urinary systems ensure the delivery of the proper amount of nitrogen to the cells.

D. Urinary systems filter out diseased and damaged cells that can be excreted from the body.