D.), because that allowed factory workers to work night shifts as well. It's not A.), because that happened during the first Industrial Revolution came about and trains became widespread. B.) doesn't make sense, because you really can only harvest in the daylight, and there's nowhere to put a light bulb. C.) is more of an effect of D.)
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Better jobs & opportunities.
A push factor would be like famine or disease in the country, etc.
Most slaves brought to America from Africa were purchased from black slave Owners
True because Java is one of the main islands