Question: What kind of climate does the Sahel have?

Is The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha (a drought-tolerant member of the Chenopodiaceae), or northern limit of Cenchrus biflorus, a grass typical of the Sahel. a good answer to this question?

Select from the following.
(a). yes
(b). no
(b).