Cheaper iron was produced after 1709 when British smelters began to use what substance as a fuel?

Cheaper iron was produced after 1709 when British smelters began to use what substance as a fuel?

Cheaper iron was produced after 1709 when British smelters began to use what substance as a fuel? 





A. kerosene
B. coke
C. charcoal
D. wood
E. gasoline






Answer: B


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