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【单选题】
淀粉溶液是一种胶体，并且淀粉遇到碘单质，可以出现明显的蓝色特征。现将淀粉和稀Na 2 SO 4 溶液混合，装在半透膜中，浸泡在盛蒸馏水的烧杯内，过一段时间后，取烧杯中液体进行实验，能证明半透膜完好无损的是
A.
加入BaCl 2 溶液产生白色沉淀
B.
加入碘水不变蓝
C.
加入BaCl 2 溶液没有白色沉淀产生
D.
加入碘水变蓝
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