Which among the following compound will give maximum enol content in solution :
A. `C_(6)H_(6)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(3)`
B. `CH_(3)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(3)`
C. `CH_(3)-overset(O)overset(||)C-CH_(2)-CH_(2)-CH_(3)`
D. `CH_(3)-overset(O)overset(||)C-CH_(2)-COOC_(2)H_(5)`