John Buyco is a Candian importer. He is on a buying trip for electronics in HongKong. He buys five containers of goods. Each container has a different product purchased from different manufacturers. He buys the following:

a. one container of television sets;

b. one container of VCRs;

c. one container of toasters;

d. one container of computer monitors ; and

e. one container of pocket calculators.

The computer monitors are supposed to be delivered in 30 days. The manufacturer calls Buyco and tells him that he can't deliver on the due date. Buyco would like to end the contract but is worried that the manufacturer will surprise him and deliver the goods within the time set out in the contract. What did denning call this type of scenario? What can Buyco do?