What role did Warfarin play in the development of pesticide-resistant rats? A. It caused the mutations, which lead to its resistance. B. It killed off the non-resistant rats. C. It selected for resistant rats. D. Both b and c. Solution Answer is \"D\". Both b and c. It kille off the non-resistant rats. It selected for resistant rats. Warfarin is a special type of medication used as a blood thinner..