8. Lipids, sugars, and amino acids can be chiral. Which statement about their stereochemical properties in nature is correct?

(A) All naturally occurring amino acids in proteins are chiral and have the L-configuration.

(B) Fatty acids in biological membranes are predominantly chiral and exist mainly as L-enantiomers.

(C) Naturally occurring sugars and amino acids both predominantly adopt the L-configuration.

(D) Most monosaccharides in biological systems have the D-configuration, and glycerol-based membrane lipids are synthesized from sn-glycerol-3-phosphate with defined stereochemistry.

(E) Biological systems contain racemic mixtures of sugars, amino acids, and lipids due to spontaneous chemical reactions.