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【单选题】
浓度均为0．1mol·L -1 的三种溶液：①碳酸钠溶液、②氢氧化钠溶液、③醋酸钠溶液，下列说法不正确的是                                                                       （   ）
A.
三种溶液的PH大小顺序是②＞①＞③
B.
若将四种溶液稀释相同倍数，PH变化最大的是②
C.
升高相同的温度，四种溶液的PH均减少
D.
水电离出的c（OH — ）：②＞③＞①
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