Polarization of electrons in acrolein may be written as:
A. `overset(delta^(+))(C)H_(2)=CH-CH=overset(delta)(O)`
B. `overset(delta^(+))(C)H_(2)=CH-overset(delta^(-))(C)H=0`
C. `overset(delta^(-))(C)H_(2)=overset(delta^(+))(C)H-CH=0`
D. `overset(delta^(-))(C)H_(2)=CH-CH=overset(delta^(+))(O)`
