Answer:
B. Contributory negligence
Step-by-step explanation:
Contributory negligence may be defined as a defense to the tort claim that is based on the negligence of the plaintiff in some law jurisdiction. And if contributory negligence is available defense completely bars the person who files the suit from any recovery if the plaintiff contributes to their own injury and harm from any negligence.
In the context, a person buys a lawn mover form a store. The lawn mover contains a instruction book where it was written that the lawn mover should not be moved over any stones or gravels or areas mixed with grass and stones.
The consumer though remembers the warning but he moves the lawn mover over land filled with loose stones and rocks. Unfortunately, a rock flies and hits him on his face resulting in serious damage of his face. And so the consumer sues the manufacturer for selling a defective lawn mover.
But the court will dis-miss the case as it was a case of contributory negligence of the consumer as the manufacturer warned the consumer with a written instruction not to use the product over areas covered with stones and rocks. Thus the defense that will give the manufacturer the best chance of having dismissing the case by the court is the Contributory negligence of the consumer.