`CH_(2)=CHunderset(OH)underset(|)CHCH_(2)CH_(2)OHunderset(/_)overset(MnO_(2))rarr A` A is :
A. `CH_(2)=CHunderset(O)underset(||)C CH_(2)CH_(2)OH`
B. `CH_(2)=CHunderset(OH)underset(|)CHCH_(2)CHO`
C. `CH_(2)=CHunderset(O)underset(||)CH_(2)CHO`
D. `CH_(2)=CHunderset(O)underset(||)C CH_(2)overset(O)overset(||)COH`