Read the passage and answer the question.
"The Great Barrier Reef, located off the coast of Queensland, Australia, is the world's largest coral reef system, stretching over 2,300 kilometers. It is home to thousands of species of marine life and is listed as a UNESCO World Heritage Site. Rising ocean temperatures and ocean acidification, both linked to climate change, pose serious threats to its survival."
What is the main threat to the Great Barrier Reef described in the passage?
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A
Overfishing by commercial fishing fleets
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B
Tourism and recreational diving damage
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C
Rising temperatures and ocean acidification from climate change
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D
Pollution from nearby Australian cities