Alkenes decolourise bromine water in presence of CCl4 due to formation of

Question. Alkenes decolourise bromine water in presence of CCl₄ due to formation of:
(a)allyl bromide
(b)vinyl bromide
(c)bromoform
(d)vicinal dibromide

Answer: (d)vicinal dibromide

CH2=CH2 + Br2 → BrCH2 – CH2Br