The description that best presents the arrangement of continents, oceans, and landforms according to the theory of plate tectonics is A: the motion of lithosphere plates over millions of years.
This option accurately reflects the key idea in plate tectonics, which involves the movement of the Earth's lithosphere (the rigid outer layer of the Earth) due to tectonic forces, resulting in the shifting of continents and the formation of oceanic and landforms over geological time.