Amphetamine a `CNS` (central nervous system) stimulant has the structural formula `C_(6)H_(5)CH_(2)CH(NH_(2))CH_(3)` Which of the following sets of reactants should be hydrogenated in the presence of nickel catalyst to prepare amphetamine ?
A. `C_(6)H_(5)CH=CHCH_(3)+NH`
B. `C_(6)H_(5)CH_(2)NH_(2)` and `CH_(3)CHO`
C. `C_(6)H_(5)CH_(2)COCH_(3)` and `NH_(3)`
D. `C_(6)H_(5)CH_(2)CHO` and `CH_(3)NH_(2)`
