Correct Answer - B
When two aldehydes or ketones (or carbonyl compounds) having `alpha`-hydrogen atom reacts in the presence of a base, they result in the formation of `beta`-hydroxy aldehyde or ketone, called the aldol condensation
Thus
![image](https://learnqa.s3.ap-south-1.amazonaws.com/images/1611758847378464772KFyF42iSVjkXEpNl.png)
is the product of aldol condensation.