In a hypotonic solution, the cell has more solute than its environment. Therefore, solvent (water) moves from the area of lower solute concentration (the surrounding solution) to the area of higher solute concentration (inside the cell). This influx of water causes the cell to swell as it takes in water, which can eventually lead to the cell bursting (lysis) if excess water continues to enter.
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.