The correct answer is 2 and 3 only. Yuan Chwang's accounts provide insights into the societal and legal practices of ancient India. He noted that ordeals by fire, water, and poison were used as methods of trial, reflecting the belief in divine intervention for justice, which aligns with the cultural practices of that time. Additionally, his observations on the trade practices confirm that merchants faced duties at ferries and barrier stations, indicative of a structured economic system with state oversight. However, the assertion that roads and river routes were completely immune from robbery is incorrect, as even in flourishing empires, issues of safety and security in trade routes were prevalent.