In Contrast to the Outer Solid Mantle, Parts of the Central

Multiple Choice

In contrast to the outer solid mantle, parts of the central regions of Earth's interior are thought to be fluid because

A) P seismic waves cannot make it through those regions.
B) S seismic waves cannot make it through those regions.
C) neither P nor S seismic waves can make it through those regions.
D) both P and S seismic waves easily make it through those regions.