The best method for the preparation of primary amines is
A. `R-X overset(NH_(2))toR-NH_(2)`
B. `R-X overset((i) NaN_(3))underset((ii) LiAlH_(4))to R-NH_(2)`
C. `R-OH overset(NH_(3))underset(Al_(2)O_(3)//Delta) to R-NH_(2)`
D. `R-X overset(NaNH_(2))to R-NH_(2)`
