The Cause of the P-Wave Shadow Zone Includes

The cause of the P-wave shadow zone includes:

A) P-waves are converted to S-waves,which cannot travel through the core
B) some P-waves are refracted upward before they reach this zone
C) some P-waves are refracted inward into the core,through which they cannot travel
D) the P-waves travel curved paths and are prevented from reaching the core-mantle boundary
E) all of these