Option d is the correct answer. Banjaras during medieval period trading groups that moved from one place to another in buying and selling goods. Theses was a special class of traders, the banjaras, who specialized in carrying bulk goods. The banjaras used to move over long distances, sometimes wit thousands of oxen carrying food grains, pulses, ghee, salt, etc. The more expensive goods, such as textiles, silks, etc., were laden on camels and mules, or in carts.