Final answer:
The nurse's priority finding when assessing a child with acute lymphocytic leukemia and receiving vincristine sulfate is paresthesia.
Step-by-step explanation:
When assessing a child with acute lymphocytic leukemia who is receiving vincristine sulfate, a nurse's priority finding would be A. paresthesia. Paresthesia is a potential side effect of vincristine sulfate and is characterized by tingling or numbness in the hands and feet. It is important for the nurse to monitor for this finding as it can indicate neurotoxicity and require immediate intervention.