Explanation
Why Correct: Directive Principles of State Policy (Part IV, Articles 36-51) explicitly mandate the state to secure social, economic, and political justice, embodying the welfare state concept through provisions for adequate livelihood, equal pay, and public health.
Distractor Analysis: Preamble declares India as a sovereign, socialist, secular, democratic republic but doesn't operationalize welfare mechanisms. Fundamental Rights protect individual liberties against state action but don't impose positive welfare obligations. Seventh Schedule distributes legislative powers between Union and States but doesn't articulate welfare state philosophy.
Takeaway: While Fundamental Rights are justiciable and enforceable in courts, Directive Principles are non-justiciable but fundamental in governance, making them the constitutional foundation for welfare legislation.