Which of the following best describes osmosis? Select one:

a.
Osmosis is the active transport of water across a membrane toward an area with a higher concentration of larger molecules.

b.
Osmosis is the spontaneous movement of water across a membrane toward an area with a lower concentration of larger molecules.

c.
Osmosis is the spontaneous movement of water across a membrane toward an area with a higher concentration of larger molecules.

d.
Osmosis is the active transport of water across a membrane toward an area with a lower concentration of larger molecules.