Explanation:

- Option 1: 68th Amendment

- This amendment pertains to the allocation of seats in the Lok Sabha and district representatives in Nagaland. It is not related to Panchayati Raj institutions.

- Option 2: 73rd Amendment

- The 73rd Constitutional Amendment Act of 1992 gave constitutional status to Panchayati Raj institutions.

- This amendment added Part IX to the Constitution and Schedule 11, ensuring a three-tier system of Panchayati Raj for all states.

- Option 3: 82nd Amendment

- This amendment dealt with changes in the provision for reservations in promotion for Scheduled Castes and Scheduled Tribes.

- Option 4: 54th Amendment

- This amendment related to enhancing the salaries of judges of the Supreme Court and High Courts.