The strongest acid among the following is

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(C) The acidity of carboxylic acids depends on the stability of the conjugate base (carboxylate ion) and the inductive effect of the substituent group

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benzoic acid

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(C) The acidity of carboxylic acids depends on the stability of the conjugate base (carboxylate ion) and the inductive effect of the substituent group attached to the $-COOH$ group.In $CH_3COOH$ (acetic acid) and $CH_3CH_2COOH$ (propionic acid), the alkyl groups exert a $+I$ effect, which destabilizes the conjugate base.In $CH_2=CH-COOH$ (acrylic acid), the $sp^2$ hybridized carbon exerts a $-I$ effect, making it stronger than aliphatic saturated acids.In $C_6H_5COOH$ (benzoic acid), the phenyl group is $sp^2$ hybridized and exerts a strong electron-withdrawing effect ($-I$ effect) and resonance stabilization of the carboxylate ion, making it the strongest acid among the given options.

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