Which of the Following Best Describes the Phenomenon Known as Wave

Which of the following best describes the phenomenon known as wave amplification?

A) Change in ground materials that causes seismic waves to slow down and have more energy.
B) Situation on a seismograph where the P-waves overtake the S-waves.
C) Situation on a seismograph where the S-waves overtake the P-waves.
D) Dangerous situation that occurs when seismic waves encounter electrical transmission lines.
E) Dangerous situation that occurs when seismic waves encounter ocean waves.