Nubela Manufacturing is considering two alternative investment proposals with the following data: Investment Useful life Proposal X $11,100,000 5 years Proposal Y $600,000 5 years Estimated annual net cash inflows for 5 years $2,220,000 Residual value Depreciation method $56,000 $101,000 $33,000 Straight-line Straight-line Required rate of return 13% 12% Calculate the payback period for Proposal X OA. 9 years OB. 8 years OC. 4 years OD. 5 years