Polarization of electrons in acrolein may be written as:
A. `overset(delta^(-))(C)H_(2)=CH-overset(detal^(+))(C)H=O`
B. `overset(delta^(-))(C)H_(2)=CH-CH=overset(delta^(+))(O)`
C. `overset(delta^(-))(C)H_(2)=overset(delta^(+))(C)H-CH=O`
D. `overset(delta^(+))(C)H_(2)=CH-CH=overset(delta^(-))(O)`
