Earthquakes Occur Because the Surface of the Earth Is Composed

Multiple Choice

Earthquakes occur because the surface of the earth is composed of giant rigid plates, and these plates are constantly moving. When one plate rubs against another, the motion of the plates in that area is halted, and strain builds up. Eventually the edge of the plate cannot withstand the increasing strain, and it breaks. The resulting shudder is felt as an earthquake.

A) Argument; conclusion: The resulting shudder is felt as an earthquake.
B) Argument; conclusion: Earthquakes occur.
C) Argument; conclusion: When one plate rubs ... strain builds up.
D) Nonargument.
E) Argument; conclusion: Eventually the edge of the plate ... it breaks.