Answer:
Impracticable
Explanation:
Impracticable is the term which is defined as the circumstances or the fact which excuses the party from performing the contractual duty as the performance might cause the unreasonable and the extreme difficulty.
So, as per UCC, delay in the delivery or no- delivery will not be a breach of contract as the fact in which the performance is made or performed is impracticable because the contingency has happened.