Olive, the owner of Olive$$s Orchard, contracts to sell its harvest to Pure Foods, Inc. Later Olive refuses to perform. Pure Foods files a suit to enforce the contract. Olive and Pure Foods are in a state that does not recognize the doctrine of unconscionability. To defend successfully against enforcement of the contract on similar grounds, Olive might rely on traditional notions of

a$.$mistake$.$

b$.$materiality$.$

c$.$value$.$

d$.$fraud$.$