Which of these statements best explains why P waves arrive earlier than S waves at the seismic station?
A. S waves are generated after P waves arrive at the surface
B. S waves make longer lines on the seismogram than P waves
C. P waves are created first and S waves originate from P waves when they are reflected by solid rocks
D. P waves move straight through all medium and S waves move only through solids in a curvy motion
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