Osmosis due to protein is related to which property?

The correct answer focuses on concentration because osmosis is fundamentally driven by the movement of water across a selectively permeable membrane, which occurs in response to differences in solute concentration on either side of the membrane. When proteins are present in a solution, they contribute to the overall solute concentration, thus influencing the osmotic gradient. Water will move from an area of lower solute concentration (more water, fewer solutes) to an area of higher solute concentration (fewer water molecules, more solutes) in an attempt to equalize concentrations.

While size, charge, and shape are important characteristics of molecules, they do not directly relate to the process of osmosis as it pertains to the movement of water due to solute concentrations. Size might affect how easily certain substances can pass through a membrane, but it does not drive osmosis itself. Charge can influence the interaction of proteins with water and other solutes, but it doesn't determine the osmotic pull created by a concentration gradient. Shape also plays a role in how proteins interact within the body but is not a primary factor in osmosis. Thus, concentration remains the key factor in determining the osmotic movement induced by proteins or any solute across a membrane.