Use the following information to answer the questions below.
Five dialysis bags,constructed from a semipermeable membrane that is impermeable to sucrose,were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution.At 10-minute intervals,the bags were massed (weighed)and the percent change in mass of each bag was graphed.

-Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution at the beginning of the experiment?