American Home Store, headquartered in San Diego, is getting ready for its Fourth of July sale. American orders $1,000 worth of American flags from Canadian Manufacturing, Inc., which is headquartered in Montreal, Canada. American places the order by telephone, and Canadian orally accepts. Two days later, American discovers that it can get the flags cheaper from a manufacturer in Denver. When American attempts to cancel the contract with Canadian, American finds that under the 1980 United Nations Convention on Contracts for the International Sale of Goods (CISG):

a: the contract is not enforceable because it is not in writing.

b: the contract is enforceable even though it is not in writing.

c: the CISG does not apply to this contract.

d: the contract is not enforceable because Canada is not a signatory to the CISG.