Final answer:
The action by the nurse that best demonstrates the concept of right supervision is checking the hospital policy before delegating a task to a licensed practical nurse.
Step-by-step explanation:
The action by the nurse that best demonstrates the concept of right supervision is option C: The nurse checks if the hospital policy allows the licensed practical nurse to perform venipuncture before delegating the task. Right supervision involves ensuring that the person being supervised has the necessary qualifications and is allowed to perform the delegated task. By checking the hospital policy, the nurse is ensuring that the licensed practical nurse meets the necessary requirements to perform venipuncture.