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26 September, 21:23

Which was not a source of urban pollution in the late 1800s? A. coal-powered factories B. horse-drawn transportation C. hydroelectric power plants D. overcrowded slums

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  1. 26 September, 21:58
    +1
    Its C. because of the word Power Plants and hydroeletric is an green energy source.
  2. 27 September, 00:31
    -1
    C hydroelectric power plants
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