$\text{Ph}-\text{C}\equiv \text{CH}\underset{{\text{H}}_{\text{2}}{\text{O/H}}_{\text{2}}{\text{O}}_{{ }_{\text{2}}}}{\overset{{\text{O}}_{\text{3}}}{\to }}\text{A}$

The product A is

• A

  Benzoic acid

• B

  Acetophenone

• C

   Phenyl glyoxal 

• D

  Benzaldehyde