Regarding a freshwater generator of the reverse-osmosis type, what statement is true?

Correct Answer: Option A — The solute is salt and the solvent is fresh water.

Reverse osmosis utilizes a semi-permeable membrane to separate components based on molecular size. In this process, salt acts as the solute (the dissolved substance) and fresh water acts as the solvent (the medium in which the solute is dissolved), with the membrane blocking the passage of the solute.