Final answer:
The xylophone is the pitched percussion instrument among the options given, which includes the snare drum, bass drum, and gong, which are unpitched.
Step-by-step explanation:
Out of the instruments listed, the xylophone is a pitched percussion instrument. Pitched percussion instruments produce notes of definite pitch, allowing them to play melodies and harmonies.
The xylophone consists of wooden bars that are struck with mallets, each bar producing a different musical pitch.
In contrast, the snare drum, bass drum, and gong are considered unpitched percussion instruments, as they do not produce a specific note or pitch when played.