春秋时代，以（）的出现为标志，表明社会生产力获得显著的发展。文化空前发展，诞生了孔子、老子等伟大的思想家；天文历法、数学及医学等科技领域也取得了许多新成就。

A：春秋五霸

B：反战性质的弭兵运动

C：铁器、牛耕

Having the client assist in the project planning ______ .

A．is not always recommended since the client does not have adequate knowledge of project management

B．enables better planning since they are familiar with project insights

C．provides only some understanding, but usually the client dealing with the project has only limited authority

D．usually confuses the situation