The correct option is D Aspartic acid
The sum total of all the chemical reactions occurring in a body is called metabolic reactions. The chemicals that form the intermediates or products of a metabolic reaction are called metabolites.
Metabolites are of two types - primary and secondary metabolites.
The primary metabolites are substances which are directly involved in the growth and development of an organism. Proteins, carbohydrates, nucleic acids and lipids are primary metabolites.
Aspartic acid is an amino acid and hence is a primary metabolite.
Secondary metabolites are compounds produced by an organism but not directly involved in growth and development. These compounds have applications in human welfare. Rubber, ricin and morphine are examples of secondary metabolites.