Soil liquefaction occurs when
A. seismic vibrations have no impact on topsoil.
B. seismic vibrations pollute the entire atmosphere.
C. seismic vibrations cause the ground to act like a liquid.
D. seismic vibrations impact only the inner core of Earth.

The question is asking to choose among the following choices that state when Soil liquefaction occurs, base on my research and further investigation, I would say that the answer would be letter C. seismic vibrations cause the ground to act like a liquid. I hope this would help