Consider the following chemical reaction :
`aFe_2O_3 (s) + bCO(g) to cFe (s) + dCO_2`
In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?

Options

A. 3, 2, 3, 1
B. 1, 3, 2, 3
C. 2,3, 3,1
D. 3,3,2, 1