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According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions?

A. (a) Locomotives using fossil fuels
B. (b) Ships using fossil fuels
C. (c) Extraction of metals from ores
D. (d) Power plants using fossil fuels

Explanation:

Explanation: EPA data indicate that power plants using fossil fuels are the largest source of sulphur dioxide emissions.