Listen to a short lecture about the Industrial Revolution. The lecturer discusses the Agricultural Revolution, the availability of coal and iron, and the invention of the steam engine. What is the main topic of the lecture?
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A
The mining of coal and iron in the 18th century.
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B
The key factors that led to the Industrial Revolution in Britain.
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C
The invention of the steam engine.
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D
The impact of the Agricultural Revolution on British society.