By Law,all Apartment Buildings in the State Where Mary Lives

By law,all apartment buildings in the state where Mary lives must have smoke alarms in the ceilings.Mary suffers smoke inhalation because the smoke alarm in her apartment building was not yet installed.To win a negligence action against the building owner,Mary would have to prove:

A) a duty existed toward her.
B) a breach of that duty.
C) injury and causation.
D) All of the above.