Which of the following statements concerning acid precipitation is incorrect?

• A. Acids that enter the atmosphere primarily affect ecosystems located less than 100 kilometers from the source of the pollution.
• B. The effects of acidification of lakes appear to be quickly reversible if their pH can be returned to normal.
• C. While regulation of emission sources has raised, the pH of precipitation in parts of the eastern United States, precipitation in many parts of the West is becoming more acidic.
• D. Sulfuric acid and nitric acid from smokestack and automobile emissions are the major causes of acid precipitation.