Within the Upper-Air Westerly Wind Flow Are Great Waving Undulations

Multiple Choice

Within the upper-air westerly wind flow are great waving undulations

A) that were first described by Hadley, an 18th century English scientist.
B) known as Rossby waves that involve contact between cooler and warmer air masses.
C) that are unrelated to the jet stream.
D) that are called Hadley cells.