Using Hydrogen (H₂)to Reduce Magnetite (Fe₃O₄)to Iron (Fe)is Considered to Be

Using hydrogen (H₂) to reduce magnetite (Fe₃O₄) to iron (Fe) is considered to be "greener" than using carbon monoxide (CO) because

A) there are more molecules of the CO₂ by-products produced than molecules of the water by-product.
B) water contributes less to climate change than carbon dioxide does.
C) using hydrogen uses much less energy than using carbon monoxide does.
D) the iron produced by using hydrogen can be replaced by aluminum more easily.

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