The correct answer is option 2, Africa. Africa is the continent that lies in the Northern-Southern and Eastern-Western hemispheres of the earth.

When we look at the map, we can see that Africa extends from the northern hemisphere to the southern hemisphere, making it the only continent that lies in both hemispheres. Additionally, Africa stretches from the eastern hemisphere to the western hemisphere, further confirming its position in all four hemispheres.

Option 1, Australia, is primarily located in the southern hemisphere and the eastern hemisphere, but it does not extend into the northern hemisphere or the western hemisphere.

Option 3, Europe, is mainly located in the northern hemisphere and the eastern hemisphere, but it does not extend into the southern hemisphere or the western hemisphere.

Option 4, South America, is primarily located in the southern hemisphere and the western hemisphere, but it does not extend into the northern hemisphere or the eastern hemisphere.

Therefore, the correct answer is Africa.