Osmosis is the movement of which substance across a semipermeable membrane?

1. Osmosis is the movement of water through a semipermeable membrane according to the concentration gradient of water. 2. While diffusion transports material generally, osmosis transports only water across a membrane. 3. The membrane limits the diffusion of the solutes dissolved in that water. 4. So any option that carries solutes along with the water is describing diffusion instead. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_