Concept:
Musical instruments are traditionally classified based on how they produce sound. String instruments, known as Tat Vadya in Indian classical music, produce sound through the vibration of stretched strings.
Step 1: Identifying the instruments that utilize strings.
Analyzing the list provided in the question:
• Sitar (A): A plucked string instrument common in Hindustani classical music.
• Saarangi (C): A bowed, short-necked string instrument.
• Violin (E): A bowed string instrument used in both Western and Indian classical traditions.
• Tabla (B): A pair of twin hand drums (percussion instrument).
• Harmonium (D): A keyboard instrument that produces sound using air and reeds (wind instrument).
Based on this classification, only Sitar, Saarangi, and Violin are string instruments.