`CH_(3)CHO+HCHOoverset("dil. NaOH")underset("Heat")rarrAoverset("HCN)underset(H_(3)O^(+))rarrB`
the structure of compound B is
A. `CH_(2)=CH-underset(OH)underset(|)(CH)-COOH`
B. `CH_(2)=CH-underset(CN)underset(|)(CH)-OH`
C. `CH_(2)CH_(2)-underset(OH)underset(|)(CH)-COOH`
D. `CH_(3)-underset(OH)underset(|)(CH)-COOH`