Answer:
C) performance of the contract is commercially impracticable.
Step-by-step explanation:
Contract law contemplates certain situations where performing the contract is either difficult or impossible and therefore the party is not liable for breaching the contract.
Commercial impracticability applies to contracts where the performance of at least one party is impracticable and cannot be accomplished.
In this case, Quinn cannot perform his duty since the price of scrap steel increased beyond any reasonable price contemplated in the contract. Since Quinn is not responsible for setting the price of scrap steel, he is not liable for breaching the contract.