According to Professor Gauderman, children are more likely to develop respiratory problems

According to Professor Gauderman, children are more likely to develop respiratory problems if they live______.

A．between 0.5 kilometer and 1.5 kilometers of a busy main road

B．as far as 1.5 kilometers of a busy main road

C．as far as 1 kilometer of a busy main road

D．within 0. 5 kilometer of a busy main road

请帮忙给出正确答案和分析，谢谢！

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