In a hypotonic solution, the cell has more solute than its environment, so solvent (water) moves from outside the cell to inside the cell. This influx of water causes the cell to swell, and it can even lead to the cell bursting if the difference in solute concentration is significant. Therefore, 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.