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【单选题】
如下图所示U形管中间被一种允许水分子通过而单糖、二糖不能透过的半透膜隔开，现在两侧分别加入0.1mol/L的蔗糖溶液和麦芽糖溶液，一段时间后左右两侧液面高度变化是怎样的？若向U形管右侧加入某种微量物质（不影响溶液浓度），右侧液面高度上升，那么加入的这种微量物质最可能是 [     ]
A.
右侧液面高度下降；麦芽糖酶
B.
右侧液面高度下降；蔗糖酶
C.
两侧液面高度不变；麦芽糖酶
D.
两侧液面高度不变；蔗糖酶
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