The second one is push factors, the first one is pull factor, the fourth one is forced migration, and the third one is chain migration, hope this helps.
the correct answer was African Union
I think that the answer is c, ridges!
<em>Yeah </em><em>buddy</em><em>, </em><em>me </em><em>too</em><em>,</em><em> </em><em>from </em><em>India </em><em> </em>
