Final answer:
Saudi Arabia produces the greatest amount of freshwater from desalination plants.
Step-by-step explanation:
The country that produces the greatest amount of freshwater from desalination plants is Saudi Arabia. Desalination is a process that removes salt and impurities from seawater, producing freshwater that is safe to use. Saudi Arabia, being a desert country with limited freshwater sources, heavily relies on desalination to meet its water needs.