What Was the Most Damaging Type of Eruption That Occurred

What was the most damaging type of eruption that occurred at Vesuvius in Italy?

A) A huge landslide caused a lateral blast that knocked down trees and buildings.
B) A fast-moving viscous lava flow flowed through the middle of Pompeii.
C) The volcano was so heavy that it caused part of the island to collapse.
D) One or more pyroclastic flows hit the city of Pompeii.
E) None of these are correct.