Identify $A$ and $B$ in the given chemical reaction sequence :-

• A
  $A = \text{4-oxo-4-phenylbutanoic acid}, B = \text{4-phenylbutanoic acid}$
• B
  $A = \text{4-phenylbutanoic acid}, B = \text{4-oxo-4-phenylbutanoic acid}$
• C
  $A = \text{1,4-naphthoquinone}, B = \text{naphthalene}$
• D
  $A = \text{1,4-naphthoquinone}, B = \text{1,4-dihydroxy-1,2,3,4-tetrahydronaphthalene}$