When the concentration of solutes differs on the two sides of a membrane permeable only to water:
A. Water will move across the membrane by osmosis.
B. Water will move across the membrane by active transport.
C. Water will move across the membrane by plasmolysis.
D. Water will move across the membrane by facilitated diffusion.
E. Solutes will move across the membrane from the region of higher concentration to the region of lower concentration.
Answer: A