Answer to Question 1
In deciding whether a change in circumstances should permit one side to escape its duties under the doctrines of commercial impracticability or frustration of purpose, courts consider the following: (a) mere financial difficulties will never suffice to discharge a contract; (b) the event which led to the claim must have been truly unexpected; and (c) if the promisor must use a different means to accomplish her task, at a greatly increased cost, she probably does have a valid claim of impracticability.
Answer to Question 2
C