The correct IUPAC name of the following compound is :
`O = underset(OH)underset(|)(C)-CH_(2) -underset(H-C = O)underset(|)(CH) - CHO`
A. 3,3 -diformyl propanoic acid
B. 3-formyl-4-oxo-butanoic acid
C. 3,3-dioxo propanoic acid
D. 3,3-dicarbadehyde propanoic acid