Most Pastoralists Do Not Breed Animals for Meat but Rather

Most pastoralists do not breed animals for meat but rather trade with agricultural groups for food. An example of this is

A) the large scale trade routes that only delt with food trade.
B) the practice in the Middle East where rugs made from wool from their sheep are sold so they can buy their food.
C) the trucking industry moving meat into agricultural areas for trade.
D) the practice in the U.S. of bartering for material goods.