Which of the Following Is Not an Example of a System

Multiple Choice

Which of the following is not an example of a system and how systems work together?

A) A volcanic eruption like the 1980 Mount St. Helens eruption created massive amounts of ash that were ejected into the atmosphere causing atmospheric cooling
B) The energy to create the 1980 Mount St. Helens came from geologic activity occurring in the mantle that created magma that rose to the surface
C) The heat that came to the surface of the 1980 Mount St. Helens eruption caused glacier fields to melt, leading to the formation of massive mudflows which impacted the hydrologic system
D) All of the above are examples of how systems work together