Which movement of African people was
 primarily caused by changes in climate and
 vegetation?
 (1) migration of the Bantu people out of West
 Africa in 1000 B.C.
 (2) journey of Mansa Musa’s followers to Mecca
 in 1324
 (3) resettlement of the Zulus within South Africa
 in 1843
 (4) flight of the Tutsis from Rwanda in 1994