The Nurse Is Caring for a Patient Who Is Having

The nurse is caring for a patient who is having blood drawn as part of preoperative testing. Which step is the most important to ensure the safety of the patient and the nurse?

A) Ensuring that the tourniquet is not left in place for too long
B) Using the smallest possible needle for venipuncture
C) Properly disposing of the needle after the specimen is obtained
D) Making sure that all of the collection tubes are filled completely