"The Amazon rainforest covers approximately 5.5 million square kilometers and produces about 20% of the world's oxygen. It is clearly the most important ecosystem on Earth and must be protected above all others." Question: Which sentence from the passage states a fact?
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A
The Amazon rainforest covers approximately 5.5 million square kilometers and produces about 20% of the world's oxygen.
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B
It is clearly the most important ecosystem on Earth.
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C
It must be protected above all others.
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D
Both the second and third sentences state facts.