31. The project budget is set at $150,000. The project duration is planned to be one year. At the completion of Week 16 of the project, the following information is collected: Actual cost = $50,000 Plan cost = $45,000 Earned value = $40,000 What is the cost performance index?

A. 0.80

B. 0.89

C. 1.13

D. 1.25