Correct Answer: (b) 20 members from Lok Sabha and 10 from Rajya Sabha.
Solution:For probing 2G spectrum scam, the proposal for Joint Parliamentary Committee was passed on 24 February, 2011 by Lok Sabha and on March 1, 2011 by Rajya Sabha. 30 members of Parliament were included in the Joint Parliamentary Committee of which 20 members were from Lok Sabha and 10 members from Rajya Sabha.