If you are going to bake potatoes, and your potatoes are soft and dehydrated, they can be soaked in to make them more firm before baking.

The correct answer would be - tap water as it is the hypotonic solution for potatoes.

Explanation:

The hypotonic solution IS the solution that has low solute content than the solvent content in which the solute dissolved.  The tap water is hypotonic cell that has a high concentration of pure water than the cells of potato.

In this case, water moves into the cells of the potato and turns it into cause them to swell. These cells become turgid and the become more firm.

Thus, the correct answer - tap water as it is a hypotonic solution for potatoes.