Shipco, a maritime shipping company, contracted with Megacorp to transport a shipment of Megacorp products from California to New York by way of the Panama Canal.After the contract was formed but before the shipment was to take place, the Panama Canal was closed.

The only way for Shipco to deliver Megacorp's products from California to New York would be to travel all the way down and around the southern tip of South America and back up to New York.The added distance would triple Shipco's costs.

Shipco's best argument to discharge their duties under the contract would be on the grounds of:

a)economic frustration.

b)versatile impossibility.

c)common law rule of disadvantage.

d)impracticability.

e)economic stability.