The P-Wave Shadow Zone Is Largely the Result of ________

The P-wave shadow zone is largely the result of ________.

A) reflection of P waves from the inner core-outer core boundary
B) lower P-wave velocities in the mantle than in the crust
C) refraction of P waves deeper into the core upon crossing the mantle-outer core boundary
D) reflection of P waves at the boundary between the inner and outer cores