The correct option is
A the ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of the cluster
These molecules contain hydrophobic (water-insoluble) part such as fatty acid or a rather long chain carbon group fatty alcohol and it is an interior part.
The molecule also contains a hydrophilic (water-soluble) group such as −COONa or a sulfo group and it is an exterior part.
The hydrophobic part attaches itself to fiber and to dirt particle and the hydrophilic part attaches to water.
Option A is correct.
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