單項選擇題欲測定樣品中Na2CO3的含量,稱試樣0.2000g,滴定到終點時,消耗C(1/2H2SO4)=0.2020mol/L硫酸溶液18.32ml,求樣品中Na2CO3的含量()

A.98.0%
B.98.06%
C.97.85%
D.98.01%
E.97.05%