In a hypotonic solution, the cell has more solute than its environment. This means that the concentration of solute is lower outside the cell compared to the inside. As a result, solvent (usually water) moves from the area of lower solute concentration (the hypotonic solution outside the cell) to the area of higher solute concentration (inside the cell) in an attempt to equalize the solute concentrations.
This movement of water into the cell causes the cell to swell, and if the influx of water continues, it may eventually lead to the cell bursting (lysis).
From your provided options, the correct response would be:
The cell has more solute than its environment, so solvent moves from outside the cell to inside the cell, causing the cell to swell.