Answer:
Option D, passed through the mantle
Explanation:
These seismic waves are P-waves as they travel deep inside the earth (nearly 3000 Km from the surface of earth)
Usually a P wave passes through the core and mantle of the earth. It propagates by compressing and refracting the particles with in the earth's core and mantle.
While passing by the core and mantle, it experience strong refractive force due to which these waves bend and their speed reduces.
Hence, option D is correct
