Which will be the least stable resonating structure :
A. `CH_(2)=CH-overset(o+)CH-overset(Theta)CH-O-CH_(3)`
B. `overset(Theta)CH-overset(o+)CH-CH=CH-OCH_(3)`
C. `overset(Theta)CH-CH=CH-CH=overset(o+)O-CH_(3)`
D. `CH_(2)=CH-overset(Theta)CH-CH=overset(o+)O-CH_(3)`