A child is admitted with a suspected diagnosis of Wilms' tumor. The nurse should place a sign with which of the following warnings over the child's bed?

A. Collecting all urine is not specific to Wilms' tumor; it may be indicated for other conditions like renal dysfunction but is not the immediate precaution. B. Contact precautions are unnecessary because Wilms' tumor is not contagious. C. Avoiding venipuncture or blood pressure in one arm is a precaution after procedures such as lymph node dissection (e.g., post-mastectomy), not for Wilms' tumor. D. Palpating the abdomen is contraindicated because Wilms' tumor is a fragile renal tumor. Manipulating it can cause tumor rupture, hemorrhage, or spread of cancer cells, making “Do not palpate abdomen” a critical safety warning.