Select the most effective sequence of the following four activities in initiating a project. (1)Define project phases；(2)Identify stakeholders；(3)Select a project manager；(4)Develop project charter.

A．(4)-(1)-(2)-(3)

B．(3)-(1)-(2)-(4)

C．(4)-(3)-(1)-(2)

D．(1)-(2)-(3)-(4)

（）不仅供给草坪草生命活动所需要的水分、养分和供根呼吸的氧气，还维持着适宜的温度和热量条件。

A.草坪土壤

B.空气

C.环境

D.肥料