The correct answer to this question is D) both, A and C.
The study on world trade and the movement of goods in the Southeast Asian region determined improvements were needed in revisions in the customs environments and make shipping ports more efficient.
This has allowed countries to better establish the trade agreements negotiations that facilitate and promote foreign trade in the region. Every country had its own regulations and legislation regarding imports and exports. These had to be revised, adapted or actualized to international norms in order to increase the interest of other countries and developed nations to trade with Southeast Asia.