油菜冬前壮苗期土壤含水率为田间持水率的（）为佳。

A.10%~14%
B.14%~16%
C.16%~18%
D.18%~20%

A.0.3~0.5m³∕d
B.0.5~0.6m³∕d
C.0.03~0.05m³∕d
D.0.05~0.06m³∕d

A.45%~55%
B.55%~65%
C.65%~75%
D.75%~85%