The correct option is A A is liable for the damage to B's car.
Section 154, Indian Contract Law, 1872, states "Liability of bailee making unauthorised use of goods bailed.—If the bailee makes any use of the goods bailed which is not according to the conditions of the bailment, he is liable to make compensation to the bailor for any damage arising to the goods from or during such use of them." A hired a car so he will be liable for the damages to B's car.