You are looking at the following data. Project A has a CPI of 0.8 and SPI of 1.2 and EV of 450. Project B has CPI of 1.2 and SPI of 0.8 and EV of 650. Which of the following statement is true ？（）
A．Project B is performing better because it has a higher earned value
B．Project A has schedule slippage and project B is ahead of schedule
C．Crashing project A is a good option
D．Crashing project B is a good option
