单项选择题

用0.1mol/L-HCl滴定0.1mol/L-NaOH时pH突变范围是9.7--4.3,用1mol/L-HCl滴定1mol/L-NaOH时pH突变范围应为()

A.9.7---4.3
B.8.7---4.3
C.9.7---5.3
D.8.7---5.3
E.10.7---3.3