As a Result of Measures to Control Acid-Deposition in North

As a result of measures to control acid-deposition in North America,over the last 20 years emissions of sulfur dioxide have been

A) steady,with little decrease in acid-deposition due to rising levels of nitrogen oxides.
B) reduced by about 10%,at great cost to the power producing industry.
C) reduced to target levels at about the projected cost of compliance.
D) reduced beyond target levels and at 10% of the projected compliance costs.

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