It’s A an generation that’s the only one that makes sense because evolution is a change over time too
The inner core is made of solid iron, the outer core is very dense liquid of iron and sulfur, The lower mantle is the layer just outside the outer core, the upper mantle is made of large plates that move, the crust is the thin, rigide layer of the earth, the lithosphere is the layer that includes the asthenosphere, and the asthenosphere is the plastic portion of the upper mantle of earth. Hope this helps.
not sure if this is what you need.
