The term "non-essential," as it applies to amino acids, means that:

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Non-essential amino acids are those that the body is able to produce on its own, in contrast to essential amino acids which must be obtained from the diet. The liver is responsible for synthesizing these non-essential amino acids, which include alanine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine. Given this definition, choices A, B, and D are all incorrect. Non-essential amino acids are called so because the liver has the ability to produce them on its own, therefore they are not essential to the diet. However, they still play important roles in protein synthesis and other metabolic processes.

The Term "Non-Essential," as It Applies to Amino Acids, Means