In a sports team each player has a clear role, and there are few __________ when members are

uncertain of their roles. [ ]

A. occasions  

B. positions

C. chances  

D. situations

在预算定额的编制过程中，已知基本用工是20工日，超运距用工为2工日，辅助用工为3工日，人工幅度差系数为10%，则该预算定额人工幅度差为( )工日。

A．2.5

B．2.3

C．2.2

D．2.0