Step 1: Understanding the Concept:
The question asks to identify the 'Avanaddha Vadyas' from the given list. Avanaddha Vadyas are membranophones, i.e., percussion instruments that produce sound through a vibrating stretched membrane or skin.
Step 2: Detailed Explanation:
- (A) Mouth Organ: This is a wind instrument (Sushira Vadya) where sound is produced by blowing air across reeds. It is not an Avanaddha Vadya.
- (B) Khol: This is a terracotta two-sided drum with parchment heads, used in devotional music in Eastern India. It is an Avanaddha Vadya.
- (C) Damru: A small two-headed drum, often associated with Lord Shiva. It is an Avanaddha Vadya.
- (D) Edakka: A traditional hourglass-shaped pressure drum from Kerala, with two skin heads. It is an Avanaddha Vadya.
Therefore, Khol, Damru, and Edakka are all Avanaddha Vadyas.
Step 3: Final Answer:
The correct combination is (B), (C), and (D).