The correct option is A Lecithin
Lecithin is a phospholipid. Phospholipids are esters of two molecules of fatty acids with a glycerol molecule and also have phosphate group attached to it. It is a constituent of cell membranes.
Arachidonic acid is a fatty acid with 20 carbon atoms.
Linoleic acid is a fatty acid with 18 carbon atoms.
Cholesterol is a derived lipid found in cell membranes. It is composed of steroid and alcohol.