What are the main reactions that occur in the blast furnace during iron extraction from hematite?

 a. Fe2O3  + 3CO → 2Fe + 3CO2 b. FeO + SiO2 →  FeSiO3 c. Fe2O3 + 3C  $$\xrightarrow[]{}$$ 2Fe + 3CO d. CaO + SiO2 $$\xrightarrow[]{}$$ CaSiO3

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

HINT: Fe2O3 is first reduced to Fe3O4 and then to FeO
Explanation:
STEP 1:
In the extraction of iron from haematite ore following reactions take place.
(i)
This reaction represents a reduction of ${\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ to $\mathrm{Fe}$.
(ii)
STEP 2:
The reactions are as follows: