If a Bulge Grows Steep Enough,it May Collapse

Multiple Choice

If a bulge grows steep enough,it may collapse.Explain how this can trigger an explosive eruption.

A) It removes the cover over the magma, so it can escape.
B) It slices through some of the gas bubbles, making them pop.
C) It doesn't trigger an explosive eruption; it does, however, create a devastating landslide.
D) The friction of the landslide heats that part of the magma, so the dissolved water flashes into steam.
E) It decreases pressure on gases dissolved in the magma, permitting them to expand.