What is the chief advantage of the virtual reality techniques when used in microsurgery

What is the chief advantage of the virtual reality techniques when used in microsurgery A: The medical students and surgeons can use it to practise simulated surgical operations as if operating on a real patient. B: Medical students and surgeons can do any operations without considering their consequences. C: It helps to do operations on human eyes extremely accurately. D: It allows surgeons and their students to set their imagination free.