Why do I have to watch over six advertisements to know the answers to my own question? It seems like is a money grabbing website to me. And I tried to post a different version of this question before, but told me not to upload it because it was "Hurtful". This website does not give off good first impressions...

When used-car dealers signal the quality of a used car with a warranty, a. buyers believe the signal because the cost of a false signal is high b. it is not rational to believe the signal because some used-car dealers are crooked c. the demand for lemons is eliminated d. the price of a lemon rises above the price of a good used car because warranty costs on lemons are greater than warranty costs on good used cars