In the following reactions,identify $P, Q$ and $R$,respectively:
$I. 3Fe_2O_3 + CO \longrightarrow 2P + CO_2 \uparrow$
$II. Fe_3O_4 + 4CO \longrightarrow 3Q + 4CO_2 \uparrow$
$III. Fe_2O_3 + CO \longrightarrow 2R + CO_2 \uparrow$
$I. 3Fe_2O_3 + CO \longrightarrow 2P + CO_2 \uparrow$
$II. Fe_3O_4 + 4CO \longrightarrow 3Q + 4CO_2 \uparrow$
$III. Fe_2O_3 + CO \longrightarrow 2R + CO_2 \uparrow$
- A$P = Fe, Q = Fe_3O_4, R = FeO$
- B$P = Fe_3O_4, Q = FeO, R = Fe$
- C$P = Fe_3O_4, Q = Fe, R = FeO$
- D$P = FeO, Q = Fe_3O_4, R = Fe$
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