The answer that  best describes what is happening in the redox reaction 4Fe + 3O2 -> 2Fe2O3 is Iron is oxidized to form rust.
Rusting is known to be a form o oxidation reaction. An iron  is known to often reacts together with the elements of water and oxygen to bring about hydrated iron(III) oxide ( rust).
Conclusively, Always note that an Iron and steel rust is formed when these elements are said to come into any form of contact with water and oxygen as as thus rusting takes place  just as seen in the redox reaction above.
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Which answer best describes what is happening in the following redox reaction?
4Fe + 3O2 -> 2Fe2O3
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