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(B) The acidity of carboxylic acids is increased by the presence of electron-withdrawing groups ($-I$ effect) attached to the carbon chain.In $CH_3CH_

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$CH_3CH_2CH(Cl)COOH$

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(B) The acidity of carboxylic acids is increased by the presence of electron-withdrawing groups ($-I$ effect) attached to the carbon chain.In $CH_3CH_2CH(Cl)COOH$,the chlorine atom is at the $\alpha$-position,which exerts a strong $-I$ effect,stabilizing the carboxylate anion significantly.In $ClCH_2CH_2CH_2COOH$,the chlorine atom is at the $\gamma$-position,and the $-I$ effect decreases rapidly with distance.Therefore,$CH_3CH_2CH(Cl)COOH$ is the strongest acid among the given options.

The strongest acid among the following compounds is

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