In terms of the highest pitches they can make, which list correctly orders the instruments and vocals from highest to lowest?

Compare the instruments’ highest notes, not their usual roles or lowest notes. A violin can play very high, the clarinet’s upper range is below the violin’s, and the French horn’s is lower still; the tuba has the lowest upper range in this list. So the correct order from highest to lowest is violin, clarinet, French horn, tuba.

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