Amy Owned a Collection of Antique Swords

Amy owned a collection of antique swords.Amy agrees to allow Mark to display the swords at his office building at no charge.Mark picks up the swords,places them in the back seat of his car and drives to the building.He stops along the way,parks and locks his car,and goes into a store to buy something.When he returns,someone has broken into the car and stolen all of Amy's swords.Amy sues Mark for the value of the swords.In this situation:

A) Mark is liable; he owed a duty of ordinary care,which he did not meet.
B) Mark is liable; he owed a duty of utmost care,which he did not meet.
C) Mark is liable; he owed a duty of slight care,which he did not meet.
D) Mark is liable; he is an insurer of Amy's swords.
E) Mark is not liable; he owed a duty of ordinary care,which he met by locking the doors of the car.