某早强减水剂进行减水率试验，拌和25L，试验结果如下：

则该外加剂的减水率比为（）。

A.17.0mm±2.5mm
B.10.00mm±1.0mm
C.20.0mm±3.0mm
D.22.5mm±2.5mm

A.5min
B.8min
C.10min
D.6min

A.0.90~1.10
B.0.70~1.30
C.0.80~1.20
D.0.85~1.15