A) This statement is accurate. Clients on hemodialysis should limit their protein intake to reduce the workload on the kidneys and minimize waste buildup. Excess protein intake can lead to the accumulation of urea and other waste products, which can be challenging for the compromised kidneys to eliminate.

B) This statement is incorrect. While clients on hemodialysis may need to limit sodium intake to manage fluid retention and blood pressure, the primary nutrient that requires limitation in their diet is protein.

C) This statement is incorrect. Clients on hemodialysis may need to monitor their calcium intake, but it is not the primary nutrient that requires limitation in their diet. Calcium levels may be affected by the use of phosphate binders and the avoidance of high-phosphorus foods, but protein restriction is more critical.

D) This statement is incorrect. Iron intake may need to be managed for clients with anemia, which is common in end-stage renal disease (ESRD) and dialysis. However, protein restriction remains a more significant dietary consideration for clients on hemodialysis.