A 70 Year Old Woman, Using the Escalator at the Airport

A 70 year old woman, using the escalator at the airport, dropped a glove. When she attempted to pick it up, she lost her balance and fell. As a result of the accident, she suffered a fractured vertebra. In an action by her against the company which had the responsibility of maintaining the escalator, the defendant company would argue which of the following as its best defence?

A) It did not owe her a duty of care.
B) It did not act below the standard of care
C) There were no damages suffered
D) Voluntary assumption of risk
E) Contributory negligence