All of the following have contributed to europe’s pollution problem by being released into the water supply, except
a.
metals
b.
fertilizers
c.
pesticides
d.
carbon dioxide

Metals, fertilizers and pesticides contributed more to pollution of Europe by being released into the water supply except carbon dioxide emissions.

Explanation:

Europe’s 60 percent of the water is polluted with various activities from industries, agriculture, chemicals, mercury from coal mining and combustion etc.Nitrates from the agricultural lands are polluting the ground waters. Salt intrusions, dangerous chemicals from the industries are polluting the habitat. Pesticides are used to control pests in agriculture which in turn is damaging the soil health to a great extent. In the recent study of emission carbon dioxide in Europe, there has been significant decrease compared to the earlier years.

Don't depend on this but logically i think c