Among the Many Beneficial Qualities of Amaranth Is Its High

Among the many beneficial qualities of amaranth is its high lysine content. Why is high lysine a desirable quality?

A) It is a natural insecticide, amaranths are rarely impacted by insects.
B) Lysine is a natural fertilizer; after harvesting the seeds the stalks are plowed back into the soil.
C) It is one of the amino acids that humans can not synthesize and must be obtained from the diet.
D) Lysine is a lipid; when pressed amaranth seeds produce large quantities of oil.