Which of the Following Events Would Probably Excuse Performance of a Contract

Multiple Choice

Which of the following events would probably excuse performance of a contract because of commercial impracticability?

A) The price of the commodity increases slightly so that the contract will not be as profitable.
B) There is an unforeseeable trade embargo causing commodity prices to triple.
C) The promisor of a personal service contract dies.
D) The subject matter of the contract is destroyed by fire.
E) The contract contains a time-is-of-the-essence clause.