In the Vedic Age trade was limited because of poor roads, causing people to use the river ways to engage in trade. So, the correct option is B.
The Vedic age is the period in the history of the northern Indian subcontinent which yokk place between the end of the urban Indus Valley Civilisation and a second urbanisation which kicked off in the central Gangetic Plain c. 600 BCE. It receives its name from the Vedas, which are liturgical texts with details of life during this period.
