Identify the correct set of reagents or reaction conditions 'X' and 'Y' in the following set of transformation: 

A

X = dil.aq. NaOH, 20°C; Y = Br₂/CHCl₃

B

X = conc.alc. NaOH, 80°C; Y = Br₂/CHCl₃

C

X = dil.aq. NaOH, 20°C; Y = HBr/acetic acid

D

X = conc.alc. NaOH, 80°C; Y = HBr/acetic acid