测定样品中Na2CO3的含量，称试样0.1000g，滴定到终点时，消耗C(1/2H2SO4)＝0.2020mol/L硫酸溶液9.16ml，求样品中Na2CO3的含量是

A.98.00%

B.98.06%

C.97.85%

D.98.01%

E.97.06%