Organic compound soluble in water contains

Carboxylic acids are soluble in water. They  form hydrogen bonds with $H_{2}O$. But when alkyl group gets larger the  solubility decreases. Formic acid, ethanoic acid, propanoic acids all are water soluble.  carboxylic acids dissolve in water and dissociate to give an acidic solution.

Hence , the correct option (B) . C,H,O