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The figure shows the pH of precipitation in the United States in 1994 (top) and 2004 (bottom). The acidity of precipitation during both time periods was most extreme in the _______ part of the country, and the acidity of precipitation in this area _______ between 1994 and 2004.Select one:a. eastern; increasedb. eastern; decreasedc. western; increasedd. western; did not change

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