Which of These Techniques Is the Primary One Used by Geologists

Which of these techniques is the primary one used by geologists and geophysicists to probe the structure of Earth's core and mantle?

A) X-ray analysis from satellites
B) extrapolation of surface features (e.g., mountain chains) into the deep interior
C) direct sampling of interior rock by deep drilling through the ocean floor
D) study of the deflection of seismic waves from earthquakes

Correct Answer:

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