A nitrile X is treated with `LiAIH_(4)` to obtain compound `Y(C_(2)H_(9)N)` reacts with benzensulfonyl chloride to give `Y(C_(13)H_(13)NO_(2)S)` which is insoluble in alkali. The compound X is-
A. `CH_(3)CONHCH_(2)CH_(3)`
B. `CH_(3)CH_(2)CONHCH_(2)CH_(3)`
C. `(CH_(3)COO^(-))(CH_(3)CH_(2)NH_(3)^(-))`
D. `(CH_(3)CH_2COO^(-))(CH_(3)NH_(3)^(+))`