The contrabassoon sounds one octave lower than the bassoon. When the same note is played on both instruments, the contrabassoon produces a sound an octave deeper. This difference in pitch is essential to their roles in musical compositions. ;
The contrabassoon sounds one octave lower than the bassoon, meaning when the same note is played, it produces a sound that is deeper. This pitch difference plays a vital role in orchestras. Therefore, the correct choice is B: It sounds one octave lower.
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