Detailed Explanation:

Answer: Option 2 — Article 21

Article 21 of the Constitution guarantees the right to life and personal liberty, which has been interpreted by the Supreme Court to include the right to marry a person of one's choice as part of personal liberty and autonomy. Landmark judgments like Shafin Jahan vs. Asokan K.M. (Hadiya case, 2018) and Lata Singh vs. State of U.P. (2006) have affirmed that the choice of a life partner is an integral part of personal liberty under Article 21.

📝 Short Notes: Right to Marry and Article 21

• Article 21: Guarantees right to life and personal liberty; interpreted expansively to include various unenumerated rights including right to marry, right to privacy, right to livelihood, etc.
• Shafin Jahan vs. Asokan K.M. (Hadiya case, 2018): Supreme Court held that the right to marry a person of one's choice is integral to Article 21; an adult has the freedom to make personal choices regarding marriage without interference from state or family.
• Lata Singh vs. State of U.P. (2006): SC upheld inter-caste marriages and stated that choosing a life partner is a fundamental right; no one can interfere with such choices.
• Shakti Vahini vs. Union of India (2018): Affirmed that liberty of choice in marriage is a fundamental right; condemned honor killings and khap panchayat interventions.
• Personal Liberty: Includes autonomy in intimate personal decisions, dignity, and freedom to choose one's life partner irrespective of caste, religion, or social approval.