Question

what happened when the cell was surrounded by a hypotonic solution?
there was no net movement of water and the cell retained its original shape.
water moved out of the cell, causing it to shrivel.
water moved into the cell, causing it to swell.

Explanation:

In a hypotonic solution, the solute concentration outside the cell is lower than inside. Water moves from an area of lower solute - higher water concentration (outside) to an area of higher solute - lower water concentration (inside) by osmosis.

Answer:

Water moved into the cell, causing it to swell.