The geographical concept of "Antipodal arrangement" refers to the distribution of land diametrically opposite to the sea. In other words, it describes the locations on Earth`s surface that are directly opposite to each other. This concept is based on the idea that the Earth is a sphere and that there are two points on the surface that are furthest apart from each other. These points are called antipodal points.

Option 1 states that antipodal arrangement refers to the distribution of land diametrically opposite to the sea. This means that if there is a landmass in one location, its antipodal point would be in the middle of the ocean. This option correctly explains the concept of antipodal arrangement.

Option 2, the profile of ocean floor, is not the accurate definition of antipodal arrangement. While the ocean floor may play a role in determining antipodal points, the concept itself is not focused solely on the ocean floor.

Option 3, the structure of continents, is also not specifically related to antipodal arrangement. Antipodal arrangement is about the relationship between land and sea, rather than the internal structure of continents.

Option 4, shifting of continents and oceans, is not the correct definition of antipodal arrangement.