Final answer:
After three days, you should find no change in the concentration of NaCl and glucose and an increase in the water level.
Step-by-step explanation:
In order to answer the question, we need to understand the process of osmosis. When a selectively permeable membrane separates two solutions with different concentrations, water molecules will move from the side with higher water concentration (hypotonic solution) to the side with lower water concentration (hypertonic solution) until equilibrium is reached.
Based on this principle, if you examine side A after three days, you should find no change in the concentration of NaCl and glucose and an increase in the water level. This is because water will move from the hypotonic side (side B) to the hypertonic side (side A), which will increase the water level.