A company uses a MARR of 10% to evaluate investment alternatives. In comparing challenger option B with an acceptable base alternative A, you find that IRRB-A>MARR. Evaluated at the MARR, which of the following must be true? 

A. none of these 

B. PWB-A < 0 

C. Alternative B is preferred to Alternative A 

D. PWB(10%) < 0 E. PWB = PWA