If current trends continue, by the year 2010 carbon emissions in the United States will soar to a level more than one-third higher than were those in 1990, according to official projections.
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Awill soar to a level more than one-third higher than were those
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Bwill soar to a level more than one-third higher than that
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Cwould soar to a level more than one-third higher than it was
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Dwould soar to a level more than one-third higher than those
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Ewould soar to a level more than one-third higher than they were
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