The source that causes the most noise pollution among the options provided is Airplane taking off. Aircraft taking off produce extremely high decibel levels, affecting large areas around airports. This surpasses the noise generated by motor vehicles, railway engines, and pop music in terms of intensity and environmental impact.
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Among the options provided, [D] Airplane taking off causes the most noise pollution. When airplanes take off, their engines produce significant noise levels, often exceeding 100 decibels near airports. This noise impacts surrounding communities, affecting quality of life and potentially causing health issues such as stress, sleep disturbances, and hearing impairment. Motor vehicles, while widespread, generally produce lower noise levels compared to airplanes. Railway engines also emit considerable noise, but their impact is localized to specific areas near railway tracks. Pop music, although loud in concert settings, does not have the widespread and continuous noise emissions that aircraft taking off do. Thus, aircraft taking off are identified as the primary source of noise pollution among the options due to their high intensity and widespread impact on surrounding areas.