The correct option is "B. Sahel "
The Sahel or Sáheles the eco-climatic and biogeographical zone of transition between the Sahara desert to the north and the Sudanese savanna to the south. It extends through the north of the African continent, between the Atlantic Ocean and the Red Sea. The Sahel covers the territory (going from west to east) of northern Senegal, southern Mauritania, Mali, northern Burkina Faso, the southern tip of Algeria, Niger, northern Nigeria, central fringe of Chad and Sudan, Eritrea and northern part of Ethiopia. It is delimited in the north by the Sahara and in the south by the less arid savannah.
no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others