The correct answer is option 2, the 73rd constitutional amendment of 1993, which gives constitutional status to the three-tier Panchayati Raj system.

Option 1, the 72nd constitutional amendment of 1992, does not give constitutional status to the Panchayati Raj system.

Option 3, the 74th constitutional amendment of 1993, provides constitutional status to the urban local bodies, also known as the Municipalities, and not to the Panchayati Raj system.

Option 4, the 75th constitutional amendment of 1994, does not exist.

Therefore, the correct answer is option 2, the 73rd constitutional amendment of 1993, which is the legislation that grants constitutional status to the three-tier Panchayati Raj system in India.