He has changed his ______. He 'll go to the countryside instead of the city. [ ]

A．way

B．decision

C．mind

D．attention

有一完全井，半径r₀=0.3m，含水层厚度H=15m，土壤渗流系数k=0.0005m/s，抽水稳定后，井水深h=10m，影响半径R=375m，则由达西定律得出的井的抽水量Q为（）。（其中计算系数为1.366）

A.0.0276m³/s

B.0.0138m³/s

C.0.0414m³/s

D.0.0207m³/s