The given reaction can occur in the presence of :

(a) Bromine water

(b) ${\mathrm{Br}}_2$ in ${\mathrm{CS}}_2,273 \mathrm{K}$

(c) ${\mathrm{Br}}_2/{\mathrm{FeBr}}_3$

(d) ${\mathrm{Br}}_2$ in ${\mathrm{CHCl}}_3,273 \mathrm{K}$

Choose the correct answer from the options given below: