Which of the following is the best topic sentence for the paragraph below?
'_____________________. This is because they provide essential shade, which can lower surface and air temperatures. Additionally, trees release water vapor into the air through a process called transpiration, which has a cooling effect. In urban areas, large trees can reduce the need for air conditioning in nearby buildings, leading to significant energy savings.'
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A
Planting trees is a popular community activity.
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B
Trees play a crucial role in mitigating the urban heat island effect.
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C
Many different species of trees can be found in cities.
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D
Trees require a significant amount of water to survive.