A Number of Lakes in North America No Longer Have

A number of lakes in North America no longer have fish in them. One reason for this is:

A) the hole in the ozone layer has allowed too much UV to penetrate the water.
B) acid rain has made the water more acidic, causing it dissolve toxic aluminum from the soil.
C) acid rain falling directly onto fish kills them instantly.
D) carbon monoxide dissolves in the water and makes it toxic.