When developing a teaching plan for a client with newly diagnosed type 1 diabetes mellitus, the nurse should explain that an increased thirst is an early sign of diabetic ketoacidosis (DKA). Which action should the nurse instruct the client to implement if this sign of DKA occurs?

A. Measuring urine output is important for monitoring fluid status but does not address the immediate issue of increasing thirst as a sign of DKA. B. Administering a dose of regular insulin as prescribed is crucial to manage elevated blood glucose levels and prevent or treat DKA. C. Resuming normal physical activity is not recommended until DKA is managed and blood glucose levels are stabilized. D. Drinking electrolyte fluids may help with hydration but is not a direct treatment for DKA; insulin therapy is essential to address the underlying issue.