When sugar dissolves in water, the mass of the solution (sugar + water) is equal to the sum of the masses of the individual components. Therefore, if Erica dissolved 30 g of sugar in water, the mass of the water will remain unchanged in terms of its own mass.
So, the answer to the question about the increase in the mass of the water specifically is:
0 g
The mass of the water does not increase as a result of dissolving the sugar; rather, the total mass of the solution increases by the mass of the sugar dissolved.