You are working on a project for Bright Idea Inc．and working on a project for a large retail bank．You have already prepared the WBS and got it signed off．Because of some new government regulations，you need to add some more activities to the WBS．You have got the change requests approved through the CB．The WBS changes in turn require which of the following ？（）
A．Cost change
B．Scope change
C．Schedule revision
D．Risk response chang
