The answer for the question is Osmosis.
The type of passive transport that involves water molecules moving from a high concentration moving from a high concentration to low concentration is Osmosis.
Explanation;
While active transport requires energy, passive transport does not require energy. The most common types of passive transports are diffusion and osmosis. Osmosis is the process in which water molecules move from a region of high water potential to a region of lower potential, down the concentration gradient across a semi-permeable membrane. Little energy is required to carry out this process and that is why it is a passive transport.