Most acidic among the given acids is:

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(C) The acidity of carboxylic acids increases with the presence of electron-withdrawing groups due to the $-I$ effect.The $-I$ effect of the chlorine

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$CH_3-CH_2-CH(Cl)-COOH$

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(C) The acidity of carboxylic acids increases with the presence of electron-withdrawing groups due to the $-I$ effect.The $-I$ effect of the chlorine atom decreases as the distance from the $-COOH$ group increases.In $CH_3-CH_2-CH(Cl)-COOH$ ($2$-chlorobutanoic acid),the $Cl$ atom is at the $\alpha$-position,which is closest to the $-COOH$ group.In $CH_3-CH(Cl)-CH_2-COOH$ ($3$-chlorobutanoic acid),the $Cl$ is at the $\beta$-position.In $Cl-CH_2-CH_2-CH_2-COOH$ ($4$-chlorobutanoic acid),the $Cl$ is at the $\gamma$-position.Therefore,$CH_3-CH_2-CH(Cl)-COOH$ is the most acidic.

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