Based on the Image, Which of the Following Is True

Based on the image, which of the following is true?

A) Since the seismic rays are straight, we can determine that the physical properties of the material do not change.
B) Since the seismic rays are straight, we can determine that the material is causing the seismic wave to slow at depth.
C) Since the seismic rays are straight, we can determine that the material is causing the seismic wave to speed up at depth.
D) The seismic wave is being refracted and reflected as it travels through the material in the image.