Which, If Any, of the Following Features Is Common to Soaps

Which, if any, of the following features is common to soaps, detergents, phospholipids, and channel-forming antibiotics?

A) They all contain fatty acids.
B) They all contain phosphate groups.
C) They all contain polypeptide chains.
D) Their function depends on the dual polarity of their molecules.
E) They have none of the above features in common.