【单选题】

Although your internet start-up company has few project management policies and procedures in place, it made a healthy profit last year.Experience, however, has taught you that some controls are required, especially for projects that change frequently. You would like to establish a change control system for your company, but must convince a group of money-hungry “20 somethings” to use it. To be effective, the change control system must include ______.

A、procedures that define how project documents may be changed
B．specific change requests expected on the project and plan to respond to each one
C．performance reports that forecast project changes
D．a description of the functional and physical characteristics of an item or system