Answer:
b) Idiophones
Step-by-step explanation:
Percussion instruments where two similar objects are clapped together to produce a sound are classified under the category of idiophones. Idiophones are musical instruments that produce sound primarily through the vibration of the instrument itself, without the use of membranes (membranophones), strings (chordophones), or air columns (aerophones). Castanets and claves are examples of idiophones where two similar objects are clapped together to create rhythmic sounds.