The reactions which occur in a blast furnace at $500-800 \ K$ during the extraction of iron from haematite are:
$(i)$ $3 Fe_2O_3 + CO \rightarrow 2 Fe_3O_4 + CO_2$
$(ii)$ $Fe_2O_3 + 3 C \rightarrow 2 Fe + 3 CO$
$(iii)$ $Fe_3O_4 + 4 CO \rightarrow 3 Fe + 4 CO_2$
$(iv)$ $Fe_2O_3 + CO \rightarrow 2 FeO + CO_2$

• A
  $(i)$,$(ii)$,$(iii)$,$(iv)$
• B
  $(i)$,$(ii)$,$(iii)$ only
• C
  $(i)$,$(iv)$ only
• D
  $(i)$,$(iii)$,$(iv)$ only