The correct option is B Valine
Essential amino acids cannot be synthesized in the body. They are supplied from food. The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
Aspartic acid, Alanine and Serine are non essential amino acids.
Hence, the option (B) is correct answer.