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 reactants $(FeCr_2O_4 : Na_2CO_3 : O_2)$?
- A$2 : 4 : 7$
- B$4 : 6 : 6$
- C$4 : 8 : 7$
- D$4 : 8 : 4$
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