To solve this problem, we need to identify which of the given amino acids is non-essential.$\newline$Essential amino acids are those that cannot be synthesized by the human body and must be obtained from the diet.$\newline$Non-essential amino acids, on the other hand, can be synthesized by the body.$\newline$Let's analyze each option:$\newline$• Option 1: Valine$\newline$Valine is an essential amino acid.$\newline$• Option 2: Leucine$\newline$Leucine is also an essential amino acid.$\newline$• Option 3: Alanine$\newline$Alanine is a non-essential amino acid because the body can synthesize it.$\newline$• Option 4: Lysine$\newline$Lysine is an essential amino acid.$\newline$Therefore, the non-essential amino acid among the options is Alanine, which corresponds to Option 3.