Francis Signs an Agreement with Sam on July 21,but 4

Francis signs an agreement with Sam on July 21,but 4 days later decides he made a bad deal.Which of the following,if true,will be a legal basis for Francis to get out of the contract?

A) He did not receive a fair price for the goods or services he sold in the contract.
B) The consideration given up by Francis was twice the value of that given up by Sam.
C) Sam breached a contract with Francis last year.
D) Both Sam and Francis are mistaken as to the subject matter of the contract.