Correct Answer: (b) 15 February, 1985
Solution:The Anti-Defection Law was passed by the Parliament on 15 February, 1985 and came into force on 1-March, 1985. The 52nd amendment to the Constitution by amending Article 101, 102, 190 and 191 and adding the 10th Schedule laid down the process by which member of House may be disqualified on the grounds of defection.