Which phrase correctly describes the african region called the sahel

The wide area of dry land that borders the southern edge of the Sahara.

It developed as a reaction to the impact of european colonialism in africa on peoples of african descent. in the  mid-20th century, activists in africa adopted pan-africanism as a rallying cry for independence from colonial rule. some african pan-africanists sought to unite the continent as one independenthope it was useful

Ithink it's f if it's not then it is c a