单选题:一定温度下,水溶液中H+和OH-的浓度变化曲线如图2,下列说法正确的是

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题目内容:
一定温度下,水溶液中H+和OH-的浓度变化曲线如图2,下列说法正确的是 A.升高温度,可能引起有c向b的变化
B.该温度下,水的离子积常数为1.0×10-13
C.该温度下,加入FeCl3可能引起由b向a的变化
D.该温度下,稀释溶液可能引起由c向d的变化
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