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【单选题】
用0.2 mol/L NaOH溶液滴定0.2 mol/L HCl和0.2 mol/L柠檬酸(H3A)的混合液(H3A的Ka1 = 7.4×10-4, Ka2 = 1.7×10-5, Ka3 = 4.0×10-7), 如果允许滴定误差为0.2%,则终点时溶液组成应为
A.
NaCl+H3A
B.
NaCl+NaH2A
C.
NaCl+Na2HA
D.
NaCl+Na3A
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