What is the most logical next event?

How to care for a cat with kidney failure
Consider a prescription diet.
If your cat has kidney failure, talk to your veterinarian. He or she may prescribe a special renal diet that contains restricted amounts of high-quality protein and minimal amounts of phosphate and certain minerals.

Possible answers:
a). This may prevent your cat from developing kidney failure if he or she is overweight. A professional renal diet should include complex carbohydrates, which provide the amino acids that are responsible for maintaining kidney function.
b). Protein, phosphate, and minerals are very difficult for the kidney to filter, so prescription diets that restrict these substances place less strain on the organ. Studies show that phosphate can also cause scar tissue to build up on the kidney, so it is doubly important to restrict phosphate in your cat's diet.
c). Your vet may also recommend a low protein diet to prevent your cat from feeling crowded or wobbly while trying to live. Your veterinarian can suggest an approved prescription diet for your cat that will allow your cat to experience a lower estrogen level with less stress.
d). Talk to your vet about brushing your cat's teeth. Brushing the teeth is relatively non-aggressive and should only be done as a last resort for dogs.
b).