The Principle Illustrated in the Christy V

The principle illustrated in the Christy v. Pilkinton case is:

A) a breach of contract is material if it is an intentional breach.
B) subjective impossibility does not discharge the contractual duty of the party.
C) objective impossibility generally discharges the contractual duty of the party.
D) commercial impracticability occurs when performance can only be accomplished under unforeseen and unjust hardship.