Desertification is the change of a normal land in desert. The expansion of the Sahara desert refers to the desertification of the Sahara.
Sahara desert is in Morocco. It is famous for its variety of land features but is most famous because of sand dune fields.
Desertification can leads to the reduction of the vegetation-covered area. The Sahara desert also is constantly expanding at a faster rate.
The cause of Sahara desertification includes both natural processes such as climate and human activities.
Thus the correct option is A.
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