What Causes Mud and Sand Volcanoes or Geysers in a Modern

Multiple Choice

What causes mud and sand volcanoes or geysers in a modern delta or low tide beach setting?

A) meteorite impacts during solar flares
B) liquefaction, dewatering, and compaction of water saturated materials at depth often caused by seismic shaking or loading changes
C) new volcanic activity boiling the water beneath the edge of the sea
D) gas venting from underlying hydrocarbon deposits