The correct option is (d) osmosis.
The passive transport of water is specifically called osmosis.
Osmosis is the spontaneous net movement or diffusion of solvent molecules over a selectively permeable membrane from a location of high water potential to a region of low water potential, in the direction that tends to equalize the solute concentrations on the two sides.
A semipermeable membrane allows water to pass through it when it moves by osmosis from a low solute concentration (low osmolarity) to a high solute concentration (high osmolarity) area. One of the key processes that plants and animals use to maintain homeostasis is osmosis.
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