Final answer:
Monitoring urine for ketones helps to identify the presence of ketosis.
Step-by-step explanation:
The nurse's best response to the client's question is option 4) Monitoring urine for ketones helps to identify the presence of ketosis. Ketones are byproducts of fat metabolism and their presence in the urine indicates that the body is using fat as an energy source instead of glucose. In the case of a client recovering from diabetic ketoacidosis (DKA), monitoring urine for ketones is important to identify any recurrence of ketosis and take appropriate action to manage it.