Name the wind instrument described as a single-reed instrument with multiple keys, commonly pitched in B-flat.

• A. Flute
• B. Saxophone
• C. Clarinet
• D. Oboe

Answer: (C)

The key idea here is recognizing a wind instrument by how it produces sound and its typical tuning. This instrument uses a single reed on a mouthpiece and a long system of keys to cover holes, which lets a player produce many notes. That combination—single-reed mouthpiece plus a wide key system—is the hallmark of the clarinet. In most school bands and orchestras, the standard instrument of this type is pitched in B-flat, meaning written notes sound a whole step lower than concert pitch.

Flutes don’t use reeds at all, so they don’t fit the description. Oboes use a double reed, not a single reed. Saxophones also use a single reed, but they come in different keys (like E-flat or B-flat) depending on the model, whereas the B-flat clarinet is the classic, defining example described.