which of the following is specifically concerned with the transport of water across the cell membrane?\na…

Brief Explanations:

Osmosis is the process by which water molecules move across a semi - permeable membrane (like the cell membrane) from an area of lower solute concentration to an area of higher solute concentration. Diffusion is the movement of any particles (not just water) from high to low concentration, and facilitated diffusion is the movement of specific molecules (not specifically water) with the help of transport proteins. So the process specifically concerned with water transport across the cell membrane is osmosis.

Answer:

a. osmosis