Correct option is B
The correct answer is (b) guitar tabla, shehnai.
In the paragraph provided, it mentions that sound is produced by vibration and different musical instruments have specific vibrating parts. It further explains that in a X the sound is produced by stretched strings, in a Y it is the stretched membrane that vibrates, and in a Z the vibrating part that produces sound is the air column.
Based on the descriptions given:
X corresponds to a guitar, as guitars produce sound through the vibration of stretched strings.
Y corresponds to a tabla, as tablas produce sound through the vibration of a stretched membrane.
Z corresponds to a shehnai, as shehnais produce sound through the vibration of an air column.
Therefore, the correct answer is option (b) guitar, tabla, shehnai.