Doug has been drinking heavily. Joe offers to buy Doug’s farm for a fair price. Believing the deal is a joke, Doug writes and signs an agreement to sell and gives it to Joe. Joe believes the deal is serious. The contract is

a. enforceable if the circumstances indicate that Doug understands what he did.

b. enforceable because Joe believes that the transaction is serious.

c. unenforceable because the intoxication permits Doug to avoid the contract.

d. unenforceable because Doug thinks it is a joke.