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

• A
  $X = \text{conc. alc. } NaOH, 80^{\circ} C, Y = Br_2 / CHCl_3$
• B
  $X = \text{dil. aq. } NaOH, 20^{\circ} C, Y = HBr / \text{acetic acid}$
• C
  $X = \text{conc. alc. } NaOH, 80^{\circ} C, Y = HBr / \text{acetic acid}$
• D
  $X = \text{dil. aq. } NaOH, 20^{\circ} C, Y = Br_2 / CHCl_3$