Fact 1: Acid rain has a negative impact on water quality.

Fact 2: Acid rain is partly caused by CFCs.

Given the two facts above, answer the question "what have a negative impact on water quality?" with the following options: 
- CFCs
 - oxygen
 - hydrogen
 - oil
 - h2o
 - mines
 - fungi
 - Cars


 

 CFCs        