FMInvestment appraisal-Discounted cashflow techniques

A company is considering a two year project which has two annual IRRs namely 10% and 25%.The sum of the undiscounted cashflows is positive. The project will necessarily have a positive NPV,when the annual cost of capital is, A more than 25% B more than 10% C between 10% and 25% D less than 25% How to answer this question?How to think about this question?