The project manager can arrange the project schedule management activities in the following order( )。
①Plan schedule Management    ②Define Activities
③Estimate Activity Durations     ④Sequence Activities
⑤Control Schedule    ⑥Develop Schedule
A．①②③④⑤⑥
B．②④③⑥⑤①
C．①③④②⑥⑤
D．①②④③⑥⑤