Which of the following statements describes a difference between the continents on Earth as scientists think they existed 540 million years ago and their existence today?

A) The continents were influenced by underlying convection currents in the mantle 540 million years ago; today this factor is no longer an influence.
B) The continents were located mainly in the Southern Hemisphere 540 million years ago; today they are distributed throughout both hemispheres.
C) The continents were moving 540 million years ago; today they no longer move.
D) The continents were devoid of life 540 million years ago; today they are full of living organisms.