The best reasoning for the water filtration technology choice is:
reverse osmosis because it requires low maintenance, and removes all contaminants such as bacteria and chemicals.
Reverse osmosis is effective at removing a wide range of contaminants, including bacteria and chemicals, and while it does require some maintenance, it is generally regarded as a reliable method for ensuring clean water. Other options listed have inaccuracies (like claiming UV doesn't require energy or removes all contaminants, which is not the case).