Final answer:
A hypotonic solution has a lower solute concentration compared to the red blood cell. The solution containing 400 mOsm non-permeating solute would be considered hypotonic.
Step-by-step explanation:
A hypotonic solution is a solution with a lower solute concentration compared to the inside of a red blood cell. In this case, the solution will have a lower concentration of solutes than the cell and cause water to flow into the cell, leading to swelling and potentially bursting. Among the given options, the solution containing 400 mOsm non-permeating solute would be considered hypotonic because it has a lower concentration of solute compared to the red blood cell.