Polarisation of electrons in acrolein may be written as :
A. `overset(-delta)(C)H_(2)=CH-overset(+delta)(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)(C)`