Which one of the following is not a part of the "Communis Humanitis"…

The correct answer is Option 1- The Sahara Desert

Commons are those resources which are not owned by anyone but rather shared by a community. This could be a ‘common room’, a ‘community centre’, a park or a river. Similarly, there are some areas or regions of the world which are located outside the sovereign jurisdiction of any one state, and therefore require common governance by the international community. These are known as res communis humanitatis or global commons. They include the earth’s atmosphere, Antarctica, the ocean floor, and outer space.