Liquefaction is caused by volcanic eruptions, happens when tectonic plates collide, wears down rocks and creates beautiful arches, happens when soil is weakened by water and seismic waves

D. happens when soil is weakened by water and seismic waves

imagine wet sand near the beach when you stannd on it it supports your wieght but if begin to move your foot in it it liquefies and your foot sinks
hope I helped

C. naturally in the environment

Dall of the above all of the choices make sense