The appropriate reagent for the transformation is

Options

A. Zn (Hg)/HCl
B. `NH_(2)-NH_(2)//OH^(-)`
C. Both (A) and (B)
D. None of the above

Explanation

Both Zn(Hg)/HCl and `NH_(2)-NH_(2)//OH^(-)` can reduce `COCH_(3)` group to `CH_(2)-CH_(3)` but HC will also bring about replacement of OH group by Cl. Therefore, the most appropriate reagent is `NH_(2)-NH_(2)//OH^(-)`.
Hence, (B) is the correct answer.