Bert operates a pumpkin patch and contracts with Ernie to provide 2,000 pounds of pumpkins, at $10 per pound, to be delivered to Sesame City for holiday pie making. An unforeseen winter frost occurs, damaging fall crops, and making it impossible for Bert to fulfill the contract for less than $20 per pound. Bert's best defense against performing the contract with Ernie would be: Group of answer choices Statute of Limitations Commercial Impracticability Impossibility of Performance Frustration of Purpose