The part of the Constitution of India which deals with the 'Directive Principles of State Policy' is

Part IV

The correct answer is Option (3) → Part IV

Part IV of the Constitution of India deals with the Directive Principles of State Policy (DPSP).

These principles are enshrined in Articles 36 to 51 and serve as non-justiciable guidelines for the State to promote social, economic, and political justice, establishing a welfare state framework. They are inspired by the Irish Constitution and are considered fundamental in governance, though not enforceable by courts (as per Article 37).

For comparison:

• Part III: Fundamental Rights (Articles 12–35)
• Part V: The Union (executive, Parliament, etc.)
• Part XV: Elections (Articles 324–329)