Most of the information about earth's interior was obtained by a) rocks of the ocean crust b) rocks in deep wells c) seismic waves d) meteorites

Earthquake waves/Seismic waves study helps to know more information about Earth’s interior.

Explanation:

Earthquake waves which are also known as seismic waves are those energy waves that move through the layers of the Earth. The results of earthquakes are the volcanic eruptions, movement of magma, large landslides and large man-made bursts are that give out acoustic energy with low-frequency.  

Seismologists are the geo-physicists Seismologists who study about the Seismic wave. A seismometer, accelerometer or a hydrophone is useful in recording the Seismic wave fields. Body waves are the waves that are travelling through the Earth are and those which travel at the Earth's surface are surface waves.