A consumer purchases a lawn mower from a retail store. It contains a tag that says the purchaser should read the instruction book that is included. He reads the book, which contains a warning not to use the mower over gravel or stones or grassy areas mixed with rock or stone. The consumer remembers the warning but when he sees how smoothly the mower operates and how effortlessly it goes over a few small stones mixed in the grass, he decides to continue using the mower in areas filled with loose stones and rocks. One day a rock flies up and shatters the consumers face, causing him to lose an eye and suffer a broken nose and jawbone. He sues the manufacturer for putting out a defective product unreasonably dangerous to the consumer. What defense may give the manufacturer the best chance of having the case dis-missed? A. Lack of privity.
B. Contributory negligence.
C. Assumption of the risk.
D. Waiver of warranty.

B. Contributory negligence

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.        

i think the answer to your question is b. directive

it is a i took the test.