Students in a social studies class have been learning about environmental issues in Africa. They are learning that parts of the Sahel are becoming desert. Which of the following would be the BEST solution to solve the problem?

A.
Teaching people better farming practices that would help ensure the growth of new trees.

B.
Teaching people purifying water techniques that would lead to cleaner drinking water.

C.
Teaching people how to use desalination plants that would ensure an adequate water supply for citizens.

D.
Teaching people better deforestation techniques that would prevent the destruction of the Sahel’s rainforests.