The yellow box represents a cell with a semi-permeable membrane. the small, blue dots represent molecules of water, and the larger, gray dots represent a solute such as sugar or salt. the membrane is thin enough for water to pass through, but it is not thin enough for the solute to pass.

Incomplete question. Here are the missing parts.

What will happen to the substances in this diagram to bring the concentrations closer to equilibrium?
A. The solute will flow into the cell from the surrounding environment.
B. Nothing will change--it is already in equilibrium.
C. Water will flow into the cell from the surrounding environment.
D. Water will flow out of the cell and into the surrounding environment.

My
D. Water will flow out of the cell and into the surrounding environment.

The solute cannot pass through and go inside the cell, water has to flow from the cell to the surrounding environment to bring the concentration closer to equilibrium.