Which compound is a soap? \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{2} \mathrm{COONa} \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{2} \mathrm{COOH} \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{+\downarrow} \mathrm{COONa} \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{14} \mathrm{COOH}

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