In a hypotonic solution, the cell has more solute than its environment. This leads to solvent (usually water) moving from the area of lower solute concentration (the hypotonic solution) into the cell, where there is a higher concentration of solute. As a result, the cell swells as it takes in water. If the influx of water continues unchecked, the cell may eventually burst.
So, the correct response is:
The cell has more solute than its environment, so solvent moves from outside the cell to inside the cell, causing the cell to swell.