S made under seal holisehby qual exchange of value by the partis to the contract. mores roughly Detriment; Preexisting Legal Duties ims purchased a heating system from Radiant Heating. Inc., for his factory. Williams insisted that a Willae included in the contract calling for service on the heating system to begin not later than the next asiness day after Williams informed Radiant of a problem This service was to be rendered free of charge during the first year of the contract and for a flat fee of $200 per year for the next two years thereafter. During the winter of the second year, the heating system broke down and Williams promptly notified Radiant of the situation. Due to other commitments, Radiant did not send a man over the next day. Williams phoned Radiant and was told that the $200 per year service charge was unecooomical and they could not get a man over there for several days. Williams in desperation promised to pay an additional $100 if Radiant would send a man over that day Radiant did so and sent a bill for $100 to Williams. Is Williams legally required to pay this bill and why? a. No, because the pre-existing legal duty rule applies to this situation. b. No, because the Statute of Frauds will defeat Radiant's claim. c. Yes, because Williams made the offer to pay the additional amount. d. Yes, because the fact that it was uneconomical for Radiant to perform constitutes economic duress which freed Radiant from its obligation to provide the agreed-upon service