An orgainc compound A upon reacting with `NH_(3)` gives `B` On heating `B` give `C.C` in presence `KOH` reacts with `Br_(2)` to yield `CH_(3)CH_(2)NH_(2) A` is .
A. `CH_(3)CH_(2)COOH`
B. `CH_(3)COOH`
C. `CH_(3)CH_(2)CH_(2)COOH`
D. `Chunderset(CH_(3))underset(|)CHCOOH`