Answer:Water level will rise in compartment A.
Explanation: Osmosis is the movement of water molecules from an area of higher water concentration to an area of lower water concentration through a semi permeable membrane. Compartment B has higher water concentration than compartment A because compartment B has 10% salt concentration which is lower than 30% salt concentration in compartment A. Therefore, water molecules will move from compartment B to compartment A thereby causing a rise in the water level in compartment A.