Rebecca Contracted Matthew Properties Inc

Rebecca contracted Matthew Properties Inc. to repair her apartment for $20,000. On completion of repairs, Rebecca observed that the garage and the attic had not been repaired. Although the contract stated that Matthew Properties will repair the garage and the attic thoroughly, Rebecca did not raise the issue. She instead made a full payment for the services rendered. In this scenario, Matthew Properties Inc. has been discharged from obligations of repairing the garage and the attic by a(n) :

A) statute of limitations.
B) waiver.
C) occurrence of condition subsequent.
D) alteration.