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题目材料：
Years ago, consumers in Frieland began paying an energy tax in the form of two Frieland pennies for each unit of energy consumed that came from nonrenewable sources. Following the introduction of this energy tax, there was a steady reduction in the total yearly consumption of energy from nonrenewable sources.
If the statements in the passage are true, then which of the following must on the basis of them be true?
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AThere was a steady decline in the yearly revenues generated by the energy tax in Frieland.
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BThere was a steady decline in the total amount of energy consumed each year in Frieland.
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CThere was a steady increase in the use of renewable energy sources in Frieland.
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DThe revenues generated by the energy tax were used to promote the use of energy from renewable sources.
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EThe use of renewable energy sources in Frieland greatly increased relative to the use of nonrenewable energy sources.
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