What was the purpose of pan africanism

D. To unite people of African descent around the world

Pan-Africanism meant to unite all people native to Africa under one cultural banner. 

Pan-Africanism is a cultural and historically movement meant to unite people around the world indigenous to Africa. The movements were most popular in the United States and Europe where indigenous blacks had been enslaved and forced to assimilate to western culture. Pan-Africanism encouraged blacks to trace their heritage and connect to African culture. Movements have even gone so far as to encouraging people to change their names and return to native religious and cultural traditions. 

They were constantly being overlooked as a people and were being controlled by people who weren't really native to their homeland.