Final answer:
Coal was the energy source in Britain that kept things cheap due to its abundance and affordability during the Industrial Revolution.
Step-by-step explanation:
The energy source in Britain that kept things cheap was coal. During the Industrial Revolution, Britain had abundant coal reserves which were cheaply and easily accessible. The use of coal as an energy source fueled the development of industries and contributed to the growth of the economy. It provided a reliable and affordable source of energy for powering machinery and heating, making it an important factor in keeping costs low.
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