Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'thrust decollement'?

A. The state of a layer of unsaturated air when its lapse rate of temperature is less than the dry-adiabatic lapse rate but greater than the moist-adiabatic lapse rate.
B. The process of depositing soil or sediments by a river or other running water. [Wikipedia]
C. A regional-scale low-angle thrust fault.
D. A rare and randomly occurring bright ball of light observed floating or moving through the atmosphere close to the ground.

Answer: A regional-scale low-angle thrust fault.