This is business law question about Legality of Object contract, can you tell me how to know this is contract question and how to answer?

13 . Wand V are parties to a Gas Sale Agreement ( GSA) under which W is required to supply it with gas up to a maximum daily quantity . Due to an explosion at a gas production facility owned by A ( the other main supplier of gas in the market ) , available supply dropped and the market price spiked . Winformed V that it would no longer supply it with the additional gas under the GSA but would supply an equivalent quantity of gas under short-term GSAS at a much higher price . This constitutes a breach of the GSA . V agreed but later argued that the short - term GSAS were voidable under the doctrine of economic duress because the pressure was illegitimate . Advise the parties of the likely outcome