Both Namibia and Botswana are mostly covered by the Kalahari Desert, along with few regions of Namibia. According to the geographical statistics, Botswana's seventy percent territory is covered by the Kalahari desert. That makes the option d. Botswana, the country mainly covered by the Kalahari Desert.
In a dictatorship the dictator controls everything and needs to control all information that is released to the public to prevent things like uprisings to stay in power.