In PTE's 'Re-order Paragraphs' task, which sentence most likely belongs at the beginning of a paragraph about urban heat islands?
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A
Planting trees in city centers can reduce surface temperatures by several degrees.
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B
Consequently, city residents face increased health risks during summer months.
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C
Urban heat islands occur when cities absorb and re-emit more heat than surrounding rural areas.
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D
This phenomenon has been documented in cities ranging from Phoenix to Tokyo.