A solution is prepared by mixing 30 g of baking soda in 70 g of water. What are the concentrations of the solute and solvent in % by mass? A. Solute: 20%, Solvent 80% B. Solute: 30%, Solvent 70% C. Solute: 60%, Solvent 40% D. Solute: 25%, Solvent 75%