Answer:
C. Central Asia has high mountain passes and vast grasslands, which are ideal for herding.
Step-by-step explanation:
"Nomadic pastoralism" refers to the activity of bringing one's livestock to an ideal area where they can graze on grasslands. This is "nomadic" in a sense that there's no stable area for herding the livestock.
The pasture area of Central Asia is vast and it makes it truly ideal for nomadic pastoralism. Its high mountain passes allow people to travel from one point to another. It gives them a route to follow. This is the reason why many people in this area herd livestock as a means of livelihood.