Carboxylic acids are easily ionised. The main reason of this statement :
Reactivity of α-hydrogen
Resonance stabilisation of carboxylate ion
Absence of α-hydrogen
The correct option is C Resonance stabilisation of carboxylate ion Carboxylic acids are easily ionized because there is resonance in carboxylate ion due to p- electron of oxygen atom shifting. So, H+ gets ionised very easily.