Political Processes In India

Step 1: Understanding Panchayati Raj.
The Panchayati Raj system was introduced to establish a three-tier system of local self-government in rural areas of India. It aims to decentralize power and promote grassroots democracy.

Step 2: Constitutional Background.
The 73rd Constitutional Amendment Act, 1992 provided constitutional status to Panchayati Raj Institutions (PRIs). It came into effect on 24 April 1993.

Step 3: Analysis of the options.

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  (A) 16th Amendment: Incorrect. This amendment is not related to Panchayati Raj.
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  (B) 48th Amendment: Incorrect. It does not establish the Panchayati Raj system.
• 
  (C) 42nd Amendment: Incorrect. Although important, it is not related to Panchayati Raj implementation.
• 
  (D) 73rd Amendment: Correct. It gave constitutional status to Panchayati Raj Institutions.

Step 4: Conclusion.
Thus, the Panchayati Raj system was implemented under the 73rd Constitutional Amendment.

Final Answer:} 73rd Amendment.