For the reaction $4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \rightarrow 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$,what is the stoichiometric ratio of the products $Na_2CrO_4 : Fe_2O_3 : CO_2$?
- A$8 : 2 : 8$
- B$8 : 4 : 8$
- C$4 : 4 : 8$
- D$8 : 2 : 6$
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