Answer and Explanation:
The correct answer is (c) 1 and 3 only
Initially it was an ad-hoc Committee: Correct. The Ethics Committee of the Lok Sabha was initially constituted as an ad-hoc Committee before becoming a permanent committee.
Only a Member of the Lok Sabha can make a complaint relating to unethical conduct of a member of the Lok Sabha: Incorrect. Complaints can be made by any person, not just by members of the Lok Sabha.
This Committee cannot take up any matter which is sub-judice: Correct. The Ethics Committee does not take up matters that are sub-judice, meaning those that are under judicial consideration and therefore prohibited from public discussion elsewhere.
Therefore, the correct statements are 1 and 3 only, making option (c) the right answer.