The correct option is
A Lipids
Lipids may be broadly defined as hydrophobic or amphipathic small molecules, that originate entirely or in part by carbanion-based condensations of thioesters and/or by carbocation-based condensations of isoprene units. A lipid is considered to be any molecule, that is insoluble in water and soluble in organic solvents. Biological lipids usually refer to a broad grouping of naturally occurring molecules which includes fatty acids, waxes, eicosanoids, monoglycerides, diglycerides, triglycerides, phospholipids, sphingolipids, sterols, terpenes, prenols, fat-soluble vitamins (such as vitamins A, D, E and K) and others. The main biological functions of lipids include their central role in energy storage, as structural components of cell membranes, and as important signaling molecules.