An Astronomer Detects a New Feature in Jupiter's Atmosphere

An astronomer detects a new feature in Jupiter's atmosphere. Subsequent observation shows that this feature is brighter than its surroundings when observed in infrared light. We can conclude that this feature is a:

A) localized storm feature.
B) region of higher density in the ammonium hydrosulfide layer.
C) region of high-altitude clouds created by upwardly moving winds.
D) deeper layer observed through a hole in Jupiter's clouds.