An organic compound having molecular mass 60 is found to be contain C=20%., H=6.67 % and N=46.67% while rest is oxygen. On heating it gives `NH_(3)` along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. the compound is
A. `CH_(3)CH_(2)CONH_(2)`
B. `(NH_(2))_(2)CO`
C. `CH_(3)CONH_(2)`
D. `CH_(3)NCO`