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. No venipuncture or blood pressure in left arm is incorrect because this precaution is typically used for clients with conditions such as mastectomy or lymphedema risk, not for Wilms’ tumor. There is no indication to restrict venipuncture or blood pressure measurements in a specific arm for this diagnosis. B. Collect all urine is incorrect because, while monitoring urine output is important in children with renal conditions, this is not the priority safety warning for a child with suspected Wilms’ tumor. Collecting urine does not address the immediate risk associated with the tumor. C. Contact precautions is incorrect because Wilms’ tumor is not an infectious condition. There is no risk of transmission, so isolation precautions are unnecessary. D. Do not palpate abdomen is correct because Wilms’ tumor is a renal tumor that can rupture if manipulated. Palpating the abdomen can cause tumor rupture, hemorrhage, and dissemination of malignant cells, which worsens prognosis. Therefore, a clear warning sign should be placed to prevent abdominal palpation by staff or visitors.