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

Which of the following definitions best describes 'passive cloud'?

A. A name sometimes given the west wind through the Straits of Gibraltar.
B. A cumulus cloud that is no longer dynamically connected with the atmospheric boundary layer via updrafts or downdrafts.
C. Small cumulus clouds that are everywhere negatively buoyant compared to the surrounding environment, but that exist because the inertia of the rising thermals feeding them from underneath is sufficient to penetrate the lifting condensation level (LCL). Morphologically, these are often cumulus humilis clouds and are typically found at the top of the convective boundary layer during daytime over land, when a strong temperature inversion aloft prevents the clouds from growing deeper. Compare active cloud, passive cloud.
D. A northwesterly wind with fine weather that blows, especially in summer, in the Adriatic; it is most frequent on the western shore and is equivalent to the etesians of the eastern Mediterranean. It is also found on the coasts of Corsica and Sardinia. Compare mistral.

Answer: A cumulus cloud that is no longer dynamically connected with the atmospheric boundary layer via updrafts or downdrafts.