Which one of the following statements is not true for a flute, a musical instrument?

A flute is a wind instrument (aerophone) that produces sound through the vibration of a resonant column of air confined within its tube. When a player blows air across the embouchure hole, an oscillating jet is created that excites the air inside the instrument, forming standing waves.

• Option D is NOT true because the "vibrating column of air" that defines the musical note and resonance is strictly contained inside the flute's body. While sound waves propagate through the external air to reach our ears, the air outside does not form a "vibrating column" that generates the sound.
• Option C is a scientifically accurate description of how woodwind instruments function.
• Options A and B relate to the fluid dynamics of the air jet; the momentum of the blowing jet influences the amplitude (loudness), and the timing of the jet's oscillations (controlled by feedback from the internal column) determines the frequency (pitch).