基本预备费的计算以下列哪一项为基数？( )

A．. Help the student become an eminent scientist
B．. Boost the persons’ social prestige in the community
C．. Increase job prospects of an individual
D．. Enhance our understanding to the natural laws

A.建设单位
B.市招标办公室
C.监理单位
D.评标委员会