The Doctrine of Frustration Is Invoked When

The doctrine of frustration is invoked when

A) the court makes a declaration to that effect.
B) the contracting parties are unable to reach an agreement and are forced to abandon negotiations.
C) the contracting parties are both mistaken about some previously known fact in a manner that prevents them from carrying out their obligations pursuant to the contract.
D) the contracting parties are both mistaken about some future set of circumstances that prevents them from carrying out their obligations pursuant to their contract.
E) the contracting parties agree on a purchase price for a particular good and the purchasing party fails to pay.