At Common Law,in Order for a Contract to Be Discharged

Multiple Choice

At common law,in order for a contract to be discharged by frustration

A) the circumstances must be such that the contractual obligations of the parties have become incapable of being performed.
B) there must be such a long interruption or delay that it renders performance really that of a different contract.
C) no party to the contract must be in default.
D) each party to the contract must be innocent.
E) all of the above