Devils Tower was formed by:

A) solidification of a magma chamber
B) sedimentation from river deposits
C) accumulations of windblown sand

Devils Tower

A striking volcanic rock formation located in the Black Hills of northeastern Wyoming, USA.

Magma Chamber

A large reservoir in the crust or mantle that is occupied by a body of magma.

Sedimentation

The process by which particles settle out of a fluid, leading to the accumulation of solid material on the floor of a water body or other surface.