Explanation:

- The Constitution of India is a vital document establishing the framework of government and guaranteeing the rights of its citizens.

- Option 1, Part IV: This part deals with the Directive Principles of State Policy. These are guidelines for the state to apply in governance to promote social welfare and economic equality.

- Option 2, Part V: Concerns the Union government, President, Vice-President, and Parliament.

- Option 3, Part III: Covers Fundamental Rights, ensuring civil liberties to individuals.

- Option 4, Part II: Deals with citizenship provisions in India.