Imagine we have these six projects with their financial information, which one is the best candidate for a portfolio. (IRR=15%)

A NPV= +34,230 , discount rate = 10% , Payback period = 3 years

B NPV= +34,230 , discount rate = 20% , Payback period = 2 years

C NPV= +22,000 , discount rate = 10% , Payback period = 3 years

D NPV= -50,000 , discount rate = 40%, Payback period = 2 years

E NPV= +50,000 , discount rate = 10%, Payback period = 2 years

F NPV= +10,000 , discount rate = 10%, Payback period = 2 years