0. An oil driller recently issued USD 250 million of fixed-rate debt at 4.0% per year to help fund a new project. It now wants to convert this debt to a floating-rate obligation using a swap. A swap desk analyst for a large investment bank that is a market maker in swaps has identified four firms interested in swapping their debt from floating-rate to fixed-rate. The following table quotes available loan rates for the oil driller and each firm: A swap between the oil driller and which firm offers the greatest possible combined benefit? A. Firm A B. Firm B C. Firm C D. Firm D