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【单选题】
根据下列几种物质溶解度曲线图，得到的结论正确的是A.
硝酸钾中混有少量氯化钠，采用冷却热饱和溶液的方法进行提纯
B.
冬天配制的氢氧化钙饱和溶液到夏天质量分数会增大
C.
80℃时，氯化钾与硫酸镁两物质的溶液中所含溶质的质量相等
D.
所有物质的溶解度均随温度的升高而增大或随温度的降低而减小
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