Which of the following is considered a woodwind instrument?

The clarinet is considered a woodwind instrument because it produces sound through the vibration of a single reed, which is attached to the mouthpiece. Unlike other instruments that may use strings or brass for sound production, woodwinds are categorized based on their method of sound generation, typically involving air flowing through a tube. The body of the clarinet is usually made of wood or a synthetic material that simulates wood, which further solidifies its classification within the woodwind family.

In contrast, the violin and cello are both string instruments that create sound by the vibration of strings, while the trumpet is a brass instrument that produces sound by buzzing the lips into a mouthpiece. Each of these instruments has distinct characteristics that define their classifications, further emphasizing the unique nature of woodwind instruments like the clarinet.