Option c is the correct answer. The term 'Sarthavaha' was used to refer to the merchants or traders who organized and led the caravans in ancient India. The word 'Sarthavaha' means 'caravan leader' or 'chief merchant' in Sanskrit. The Sarthavahas belonged to the Vaishya varna, which was one of the four social classes in the Vedic society. The Vaishyas were engaged in agriculture, trade, commerce, and crafts. They were considered as the third highest varna after the Brahmanas (priests and scholars) and the Kshatriyas (warriors and rulers). The Shudras (servants and laborers) were the lowest varna.