Nina Hired Sue to Work as a Janitor in Nina's

Nina hired Sue to work as a janitor in Nina's apartment building.Sue was negligent in that she left a crack in the marble staircase unrepaired,without putting up a warning sign.Seth slipped on the staircase and suffered severe injuries.Who is liable for this accident?

A) Nina is liable for the accident under the doctrine of respondeat superior.
B) Sue is liable for the accident since she did not perform her duty with reasonable care.
C) Sue will be held liable for committing an intentional tort out of her scope of employment.
D) Nina will be directly liable for Sue's negligence.