Q: Fact 1: Acid rain has a negative impact on water quality. Fact 2: Sulfur dioxide causes acid rain. Given the two facts above, what has a negative impact on water quality?

Choose from:
(I) Reverse osmosis;
(II) fossil fuels;
(III) Fresh water;
(IV) Carbon filter;
(V) chlorofluorocarbons;
(VI) Sulfur dioxide;
(VII) Pollution;
(VIII) harmful substances;
A:
(VI)