I think the answer could be B or D?
Answer: Coal was needed in vast quantities for the Industrial Revolution. ... However, as the country started to industrialise itself, more and more coal was needed to fuel steam engines and furnaces. The development of factories by Arkwright and the improvement of the steam engine by Watt further increased demand for coal.
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The line of succession follows the order of: vice president, speaker of the House of Representatives, president pro temp ore of the Senate, and then the eligible heads of federal executive departments who form the president's Cabinet.
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