Which of the following is best sequence of reagents for the conversion of :
A. `overset(Br_2//Fe)tounderset(Delta)overset("Conc."H_2SO_4)tooverset(CH_3Cl//AlCl_3)toundersetDeltaoverset(H_3O^(o+))to`
B. `overset(CH_3Cl//AlCl_3)tooverset("Conc."H_2SO_4)tooverset(Br_2//Fe)toundersetDeltaoverset(H_3O^(o+))to`
C. `overset(CH_3Cl//AlCl_3)tooverset(3Cl_2//hv)tooverset(Br_2//Fe)tooverset(Zn//HCl)to`
D. `overset(HNO_3+"conc."H_2SO_4)tooverset(CH_3Cl//AlCl_3)tooverset(Sn//HCl)tooverset(NaNO_2//HCl)tooverset(CuBr)to`
