One Reason Amaranths Hold Great Promise as a Food Plant

One reason amaranths hold great promise as a food plant is that

A) they can interbreed with other established major food plants.
B) their seeds are high in protein and lysine relative to traditional food crops.
C) it is biennial, producing two crops per year rather than a single crop.
D) amaranth can be planted at densities up to 5 times greater than corn or wheat.