How was the development of vietnam different from that of other southeast asian kingdoms and empires?

Nam Viet was located in today’s northern Vietnam. They developed differently than other Southeast Asian kingdoms and empires, because they were controlled by the Chinese for a good deal of time. The Chinese influenced their culture more than India. Conquered by the Han of China in 111 BC, they were not free from the rule of China until a rebellion occurred in 939 (although they had tried several times prior). Amazingly, when the Mongols attacked in 1200, the Vietnamese were victorious and were able to maintain their independence. 

So the answer to your question is (C) Controlled by the Chinese! 

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C, because he has a direct link and profit from the trade. the fastest way by boat to transport those goods is via the panama canal.