Which one of the following biomolecules is correctly characterized?

Lecithin is a triglyceride lipid where one fatty acid is replaced by phosphoric acid which is linked to additional nitrogenous group called choline. It is a common membrane lipid. It is an amphipathic phospholipid having both hydrophilic polar and hydrophobic non-polar groups. The hydrocarbon chains of two fatty acids function as hydrophobic non-polar tails whereas the phosphate and choline behave as hydrophilic polar head group of the molecule.
Palmitic acid is a saturated fatty acid (as it does not possess double bonds in its carbon chain) and contains 16 carbon atoms with formula ${\mathrm{C}}_{16}{\mathrm{H}}_{32}{\mathrm{O}}_2$.
Adenylic acid or adenosine monophosphate is a nucleotide formed by union of adenine (nitrogenous base), ribose (pentose sugar) and phosphate. It is formed through phosphorylation of nucleoside as phosphate combines with sugar molecule at its $5^{\prime }$ carbon atom. Amino acids are organic acids with carboxylic group $(-\mathrm{COOH})$ having amino group $\left(-{\mathrm{NH}}_2\right)$ generally attached to $\alpha$-carbon or carbon next to carboxylic group. Alanine is a nonpolar and neutral amino acid having one methyl group and having amino group attached to carbon next to carboxylic group. Alanine