The answer to your question is,
C) The city states population of citizens was small
-Mabel <3
The Constitution mandates that Congress convene at noon on January 3, unless the preceding Congress by law designated a different day. P.L. 113-201 set January 6, 2015, as the convening date of the 114th Congress.
Answer;
-Reduced trade barriers and streamlined customs procedures has allowed goods to be easily and readily available throughout the trans-Pacific.
Explanation;
-Reduced trade barriers allow producers to enter foreign market without increasing the price of their product, which improve their overall sales. Removing trade barriers helps emerging markets boost economic growth.
-The streamlined customs procedures minimize the cost by focusing on a specific type of products (mainly electronics)
I believe the answer is b because there were often wars between African clans and the best way to get rid of the prisoners and get things they needed at the same time was to trade them.