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)

下列有关估测值的说法，符合实际的是（　　）

A．一个苹果质量约有1.5kg

B．冬天，洗澡水的温度约为78℃

C．某中学生重约为500N

D．蜗牛爬行的速度约为0.1m/s