Read the passage: 'The Amazon rainforest produces about 20% of the world's oxygen and is home to roughly 10% of all species on Earth. Deforestation threatens this vital ecosystem.' What is the main purpose of this passage?
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A
To argue that deforestation should be illegal
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B
To inform readers about the Amazon's importance and a threat it faces
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C
To persuade readers to visit the Amazon rainforest
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D
To explain how oxygen is produced by plants