A student's essay begins with: 'Climate change is a topic that is very important and people have written about it a lot.' Which revision best improves the opening?
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A
Keep it as is — it introduces the topic.
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B
Climate change threatens ecosystems, economies, and human lives — making it the defining challenge of our century.
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C
Climate change is very very important and lots of people care about it.
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D
People write about climate change often because it matters.