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