Which of the Following Accurately Describes Communities of Transhumant Herders

Which of the following accurately describes communities of transhumant herders in Afro-Eurasia around 3500 BCE?

A) People settled in small mountain valleys where they could more easily keep watch over their herds.
B) People lived in the coastal lands where water supplies were easily available for their herds.
C) Oxen became a crucial component of survival so that nomadic pastoralists could move their villages.
D) Herders traded meat and animal products for grains,pottery,and tools with settled agricultural communities.