问题：
[单选题] The earned value technique is a commonly used method of performance measurement. It integrates project scope, cost, and schedule measures to help the project management team assess project performance
A、the project is a head of its planned schedule
B、less work was completed than was planned
C、the cost overrun for work completed
D、the cost under-run of performance to date
参考答案：
B、less work was completed than was planned
● 参考解析
