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