Earth's Internal Layers Were Discovered by Studying the Propagation of P-

Earth's internal layers were discovered by studying the propagation of P- and S- waves through Earth's interior.In comparison to P-waves,the movement of S-waves are

A) faster and compresses and expands the rock as they move through it.
B) faster and vibrates rock particles up and down and side-to-side.
C) slower and can travel through solid granite,magma,water or air.
D) slower and they can only travel through solids,not liquids.