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【单选题】
能证明 20°C 一硝酸钾溶液已达到饱和的方法是( )A.
在 20℃ 时，向该溶液中加入少量水，溶液变稀
B.
取少量溶液降温至 10℃ 有固体析出
C.
在 20℃ 时，向该溶液中加入少量硝酸钾晶体，晶体不再溶解。
D.
取少量溶液加热至 50℃ 无固体析出
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