Ed M. answered 07/12/16
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Help with grammar, French, SAT Writing, the TOEFL and ESL.
Of the answer choices you give, I believe that "d) All of the above are correct" is the best answer to your question because not only was coal the principal fuel that that fired English factories (referred to by choice "b)") but the extensive canal system of the country supported the transport of raw materials to the factories and the subsequent distribution of finished goods from them (choices "a)" and "c)"). Indeed, Great Britain's canals have been dubbed the "routes of the Industrial Revolution" (http://www.canalmuseum.org.uk/history/ukcanals.htm).