Elinore is asked to invest $4,800 in a friend's business with the promise that the friend will repay $5,280 in one year's time. Elinore finds her best alternative to this investment, with similar risk, is one that will pay her $5,232 in one year's time. U.S. securities of similar term offer a rate of return of 6%. What is the opportunity cost of capital in this case? OA. 6% OB. 11% O C. 10% OD. 9%