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jerrywu
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In C charcoal's(possessive is flawed).

A is best among the stink
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I think it should be A
if we break A we get
(I) the average output of ironwork tripled as a result of several improvements in blowing machinery
(II)the average output of iron work tripled because coal replaced charcoal as the fuel used in the smelting of iron ore. 
These two parts have been joined by the conjunction
and so A sounds sensible.



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