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

Which of the following definitions best describes 'turbulence'?

A. Irregular fluctuations occurring in fluid motions.
B. The region of turbulence immediately to the rear of a solid body in motion relative to a fluid
C. Turbulence produced by shear flow.
D. The turbulent perturbations of temperature remaining in a stable boundary layer after all turbulent motions have died out.

Answer: Irregular fluctuations occurring in fluid motions.