The correct option is D an addition reaction
Unsaturated hydrocarbons (alkene, alkyne) generally show addition reactions.
C2H4 is treated with Br2 in carbon tetrachloride to produce an addition reaction product CH2Br−CH2Br.
CH2=CH2+Br2CCl4→Br−CH2−CH2−Br
1,2−dibromoethane