Essential Amino Acids Must Be Supplied in the Diet Because

Essential amino acids must be supplied in the diet because:

A) essential amino acids are the only ones that can be oxidized when necessary for ATP synthesis and cellular respiration.
B) essential amino acids are necessary for protein biosynthesis, but we do not have the biochemical pathways to synthesize those amino acids.
C) proteins cannot be synthesized without amino acids, therefore all amino acids are essential.