A Project Has Four Activities: A, B, C, and D

A project has four activities: A, B, C, and D. The amount spent on each activity to date is $22K, $14K, $12K, and $28K respectively. The planned percentages complete for the current date are 90%, 80%, 70%, and 20% respectively. The actual percentages complete for the current date are 100%, 90%, 75%, and 10% respectively. The actual cost of the work performed to date is $40K. What is the schedule performance index for the project?

A) Less than zero
B) 0 − 1.05
C) 1.051 − 1.10
D) 1.11 − 1.15
E) Over 1.15