While completing a project a project manager realizes be needs to decrease project costs. After researching his options, he comes up with the following choices. Which choice would DECREASE project costs ？（）
A．Change to component A from component Component A costs more to purchase but has a lower life cycle cost than
B．Change task A to be completed by resource B instead of Resource C, Resource B is a more experienced worke
C．Move tasks B and H to occur concurrently, and take the risk of a 30% increase in the need for five more resources late
D．Remove a test from the project pla