Which of the following carboxylic acids undergoes decarboxylation on heating ?
A. `C_(2)H_(5) - CO - CH_(2)COOH`
B. `C_(2)H_(5) - CO - COOH`
C. `C_(2)H_(5) - underset(OH)underset(|)(CH) - COOH`
D. `C_(2)H_(5) - underset(NH_(2))underset(|)(CH) - COOH`