Sangam literature describes salt merchants (Umanar) primarily transporting their goods using:

The correct option is

Carts with their families

Explanation

In the Sangam Age economy, internal trade was as significant as foreign trade. Salt was a crucial commodity produced in coastal salt pans (uppalam) and required transportation to the interior hinterlands. The merchants specialized in this trade were known as Umanar.

Detailed Analysis:

• Role of Umanar: The Umanar were a specific community of salt merchants who facilitated the exchange of salt for other goods, primarily paddy, under the barter system.
• Mode of Transport: Sangam literature, including works like Perumpanarruppatai and Akananuru, provides vivid descriptions of these merchants. They are depicted traveling in long caravans to ensure safety from highway robbers.
• Specific Description: The texts explicitly describe the Umanar transporting salt in bullock carts. A distinctive feature mentioned in these poems is that they often traveled with their families, making the trade expeditions a collective family enterprise.
• Comparison with other options: While maritime trade (ships) was prominent for foreign exports, and head loads were used for minor local exchanges, the bulk transport of salt to the interior by the Umanar is characteristically associated with bullock carts and family caravans.

Key Takeaway:
The Umanar were salt merchants of the Sangam Age who transported salt from coastal areas to the interior using bullock carts, often traveling in caravans accompanied by their families.