The soap molecule has a :

The soap molecule is made up of a Hydrophilic head and a hydrophobic tail.

The molecules of soap consists of sodium or potassium salts of long-chain carboxylic acids.

Hydrophilic head contains polar anion such as carboxylate ion which is water soluble. While Hydrophobic tail contains non polar carbon chain which is oil soluble.

Hence option A is correct.