How May a Party's Contractual Obligations Be Discharged

Multiple Choice

How may a party's contractual obligations be discharged?

A) Performance is the only way a party's contractual obligations may be discharged.
B) Performance or the failure of a condition to occur are the only ways a party's contractual obligations may be discharged.
C) Operation of law is the only way a party's contractual obligations may be discharged.
D) Discharge may occur through material breach by one or both parties.
E) Discharge may not occur through the failure of a condition to occur.