Explanation:
The correct answer is:
A. the level of X would rise, Y would fall


If solution Y is more concentrated than solution X, osmosis will occur — water will move from less concentrated solution X (more water, less solute) to more concentrated solution Y (less water, more solute) through a semi-permeable membrane.

But in this case, since Y is more concentrated, water will move from X to Y, causing the volume in Y to increase. However, if the figure is showing a U-tube osmometer, the liquid level in side X would fall, and in side Y would rise.

Wait — that contradicts option A.

Let's look again.

Actually, if Y is more concentrated, water moves from X to Y, so:

- Water leaves X → level of X falls
- Water enters Y → level of Y rises

So the correct answer should be:

D. The level of Y would rise and X would fall