The ideal of “Welfare State” in the Indian Constitution is enshrined in its

The correct option is Directive Principles of State Policy.

The concept of a "Welfare State" aims to promote the social and economic well-being of its citizens by ensuring social justice, economic equality, and public welfare. In the Indian Constitution, this philosophy is primarily enshrined in the Directive Principles of State Policy (DPSP), which are detailed in Part IV (Articles 36 to 51).
DPSPs serve as guidelines and principles for the government to keep in mind while framing laws and policies. They direct the State to secure a social order for the promotion of the welfare of the people, minimize inequalities in income, status, and opportunities, and provide resources like education, healthcare, and decent working conditions, thereby establishing a democratic welfare state.