Which of the Following Is a Way Native Americans Engaged

Which of the following is a way Native Americans engaged in "genetic engineering"?

A) They experimented with teosinte and produced maize.
B) They selectively bred cattle and produced the longhorn steer.
C) They crossed barley with rye and began harvesting wheat.
D) They killed only the oldest and weakest wild animals and allowed the strongest to procreate.
E) They built specialized fish ponds where they bred the most nutritious fish.