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【单选题】
常温时，用0.1000 mol/L NaOH 滴定 25.00 mL 0.1000 mol/L某一元酸HX ，滴定过程中pH 变化曲线如图所示。下列说法正确的是
A.
滴定前，酸中c(H + ) 等于碱中c(OH - )
B.
在A点，c(Na + ) > c(X - )> c(HX)> c(H + )> c(OH - )
C.
在B点，两者恰好完全反应
D.
在C点，c(X - ) + c(HX) ='0.05' mol/L
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