Which of the following pairs of structures is not a pair of resonating structures?
A. `H-C-=overset(o+)NHandH-overset(o+)C=overset(* *)N-H`
B. `CH_(3)-CH=CH-CH_(3)and CH_(3)CH_(2)=CH_(2)`
C. `CH_(3)-underset(O)underset(|)C=CH-underset(O)underset(||)C-CH_(3)andCH_(3)-underset(O)underset(||)C-overset(Ɵ)CH-underset(O)underset(||)O-CH_(3)`
D.
