Final answer:
Water moves from hypotonic solutions to hypertonic solutions in osmosis.
Step-by-step explanation:
Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of higher concentration to an area of lower concentration. In osmosis, water moves from hypotonic solutions to hypertonic solutions.
Therefore, the statements 'hypotonic → hypertonic' and 'hypertonic → hypotonic' are both true. Additionally, the statement 'isotonic → hypotonic' is also true, as water will move from an isotonic solution to a hypotonic solution.
In contrast, the statements 'hypertonic → isotonic' and 'both choices C and D' are not true, as these do not describe the movement of water in osmosis.