The Sahel refers to the
a. the part of the Sahara that borders Egypt on the east and Tunisia in the west and the Mediterranean on the north.
b. East African coastline that became the primary point of contact for Muslim merchants from India and southeast Asia and African traders.
c. series of trading ports that rapidly developed along the Atlantic coast to support the trade in African slaves.
d. grassland belt at the southern edge of the Sahara that served as a point of exchange between the forests of the south and north Africa.
e. forest zone of central Africa that remained free of Islamic influence largely because of the inability of the camel to withstand the climate of the region.
Answer: D