Read the passage: 'The Amazon rainforest, often called the lungs of the Earth, produces about 20% of the world's oxygen. It spans nine countries and is home to approximately 10% of all species on Earth. Despite its importance, deforestation has reduced its size significantly.' What is the MAIN IDEA of this passage?
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A
The Amazon produces exactly 20% of the world's oxygen
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B
The Amazon rainforest is a vital but threatened ecosystem
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C
Deforestation is the world's most urgent environmental problem
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D
The Amazon rainforest spans exactly nine countries