Which of the following instances is sufficient reason to cause commercial impracticability?

Question

Quizplus · Accepted Answer

To be successful in claiming excuse based on impracticability,a promisor must be able to establish that the event that makes performance impracticable occurred without his fault and that the contract was made with the basic assumption that this event would not occur.Cost and market fluctuations,and the shortage of goods are assumptions that would automatically be taken into account in commercial transactions.

Which of the Following Instances Is Sufficient Reason to Cause