Cultural and intellectual manifestations of Pan-Africanism have been devoted to recovering or preserving African "traditions" and emphasizing the contributions of Africans and those in the diaspora to the modern world. Pan-Africanists have invariably fought against racial discrimination and for the political rights of Africans and descendants of Africans, have tended to be anti-imperialist, and often espoused a metaphorical or symbolic (if not literal) "return" to Africa.
The correct answer is B. Lech Walesa. Walesa was also later the president. Gorbachev was Russian, not Polish, and A and C are the same person: the pope, which is also a famous Pole, but was not the leader of Solidarity.