Concept:An alkanoate is a type of ester, and natural oils and fats are basically esters of glycerol.
Explanation:Alkanoates, commonly known as esters, are formed when an alcohol reacts with an alkanoic acid.
In nature, fats and oils are long-chain alkanoates of glycerol.
Such fats and oils are included in the larger group of biomolecules called lipids.
Since lipids are the natural storage form of fats and oils, alkanoates are found in lipids.
Vitamins, proteins, and rubbers are not esters and do not primarily contain alkanoate groups.
Answer:A. lipids