In the recent years Chad, Guinea, Mali and Sudan caught the international attention forwhich one of the following reasons common to all of them?

1. A

   Discovery of rich deposits of rare earth elements

   Rare earths. Not the common headline.

2. B

   Establishment of Chinese Military bases

   Chinese military bases. Not common to all four.

3. C

   Southward expansion of Sahara Desert

   Sahara expanding south. A Sahel climate story, not the shared 2020s headline.

4. D

   Successful coups

   Successful coups. Chad, Guinea, Mali and Sudan all saw military takeovers in the recent past.

Summary. Official key is (d). Chad, Guinea, Mali and Sudan drew global attention for successful coups (and coup attempts that seized power) in the late 2010s–2020s. Rare earths, Chinese bases and desertification are not the shared reason.