Polarization of electrons in acrolein may be written as:
A. `overset(+delta)(CH_(2)) = CH - overset(- delta)(CHO)`
B. `overset(- delta)(CH_(2)) = CH - overset(+delta)(CHO)`
C. `overset(-delta)(CH_(2)) = CH - overset(+ delta)(CHO)`
D. `overset(+delta)(CH_(2)) = CH - overset(- delta)(CHO)`