Which of the Following Is a Defense That a Defendant

Which of the following is a defense that a defendant could raise in an action based on strict liability?

A) The plaintiff negligently failed to observe a sign on a highway warning of blasting operations and was injured from the operations.
B) The owner of a car signed a waiver of potential damages if he parked his vehicle in a blasting zone as a result of which the car was damaged.
C) A child played with a neighbor's pet raccoon which had escaped from its cage.The child teased the pet and was bitten.
D) All of these are valid defenses which would be successful if raised by the defendant.