Australia
Australia is a single continent, as well as being one nation on that continent. It is not the same as Oceania which is often referred to as a continent, but which is only a geographical region, not a true continent.
Africa is not a single nation it is a continent of 53 independent countries
Australia is a continent country because the entire continent is occupied by a single country, Australia. No other continent on earth is occupied by a single nation as Australia is.
Australia.
Australia
Australia
Australia. Australia is the only nation in the world that is also a continent.
Antarctica is not 'occupied' by any nation.
That'd be Australia, the only Place that's both a continent and a nation.
The continent of Antarctica has no primary language. This is because it has no indigenous people, nor any permanent settlements by a single nation.
Perhaps you mean what continent is ruled by one nation? In which case the answer is Australia.