The correct answer is 4 - 1985. The Anti-Defection Law was indeed passed by the Indian Parliament in 1985. This law was enacted to address the issue of political defections, where elected representatives would switch parties for personal gains or political motives. The law aims to prevent such defections and promote stability by disqualifying elected representatives who defect from their party.

Option 1 - 1986 is incorrect as it is a year after the law was passed. Option 2 - 1988 is also incorrect as it is two years after the law was passed. Option 3 - 1984 is incorrect as it predates the passage of the law.

Hence, the correct answer remains option 4 - 1985.