The National Social Assistance Programme launched by the Government of India fulfills the provisions of the Constitution of India mentioned under option 3 only, which is Directive Principles of State Policy.
Directive Principles of State Policy are guidelines or principles that are provided in Part IV of the Indian Constitution. They are not enforceable by any court, but the government is expected to keep these principles in mind while making laws and policies. The objective of these principles is to promote the welfare of the people by establishing a just society.
The National Social Assistance Programme is a welfare scheme that aims to provide financial assistance to the elderly, widows, and disabled individuals in need. It falls under the purview of Directive Principles of State Policy as it seeks to fulfill the government`s responsibility of ensuring social justice and welfare for vulnerable sections of society.
Therefore, option 3 - "3 only" is the correct answer as it correctly identifies the provision of the Constitution fulfilled by the National Social Assistance Programme.