(A) The hydrophobic tail of the soap molecule is in the interior of the cluster, whereas hydrophilic end is on the surface of the cluster.
The textbook clearly states: "clusters of molecules in which the hydrophobic tails are in the interior of the cluster and the ionic ends are on the surface of the cluster" — this is the definition of a micelle. The hydrophobic tail avoids water by pointing inward; the ionic (hydrophilic) end faces the water outside. Option (A) matches this exactly.