Correct Answer is B. At the end of two weeks this task is 75% complete. The PV was to be 4 person-weeks, two people working full time for two weeks. The EV is therefore 3 person-weeks, .75 x 4. The AC is 2 person-weeks. The cost performance index (CPI) is the EV / AC. i.e., CPI = 3 person-weeks / 2 person-weeks 1.5.