Nomadic Livestock Herding Is

Nomadic livestock herding is:

A) based on herding animals such as sheep, cattle, goats, and camels, often in arid areas unsuitable for cultivation
B) based on romantic and religious adherence to traditional folkways, rather than a response to environmental conditions
C) a growing response to providing extensive, low-technology food in arid regions and is, therefore, encouraged by governments such as China, Kazakhstan, and Mongolia
D) practiced throughout at least 30 percent of the world's land area by millions of people