Bill Is a Technician at a University Chemistry Lab and Is

Bill is a technician at a university chemistry lab and is in charge of safety inspections and prevention of injury due to faulty equipment, and Bill's job includes the repair of faulty equipment. One morning, as a result of his inspection, Bill discovers a gas burner with a broken valve and does a very poor job of repairing it, using techniques not considered proper or acceptable. When the morning class arrives, Halle uses the faulty burner and is burned when it catches fire. Bill's negligence is based on:

A) nonfeasance.
B) misfeasance.
C) negligence per se.
D) res ipsa loquitur.