Answer:
A
Air quality decreases as desertification leads to the death of oxygen-producing plants.
Explanation:
The above describe the relationship between desertification and air quality in Africa. This is because, plants helps in the maintenance of balance between the oxygen availability and air in circulation. Naturally, plants takes carbon(iv) oxide to manufacture its foods thereby giving out oxygen as one of its waste products.
The removal of plant trees (commonly called deforestation) leading to barren land area (desertification) reduces the oxygen availability and the air quality.