In the diagram of the earth's interior which part causes the diffraction of p waves made by earthquakes?

The choices can be found elsewhere and as follows:

Mantle
Inner Core
Outer Core
Crust

I believe the correct answer is the third option. It is the outer core that causes the diffraction of p waves made by earthquakes. Hope this answers the question. Have a nice day.

None   they are   equally likely to occur on any plate boundary