A) Incorrect. Restricting fluid intake may not be appropriate for clients with nephrotic syndrome, as they may already have reduced fluid intake due to decreased glomerular filtration.

B) Incorrect. Elevating the client's legs can help reduce edema, but a low-sodium diet is a more direct and essential intervention for managing fluid retention in nephrotic syndrome.

C) Correct. A low-sodium diet is crucial in managing edema in nephrotic syndrome. Sodium intake can lead to fluid retention, and reducing sodium intake helps decrease edema.

D) Incorrect. Monitoring blood glucose levels is important for clients with diabetes, but it is not directly related to managing edema in nephrotic syndrome.