Which one among the following is a Fundamental Duty of citizens under the Constitution of India ?

The Fundamental Duties of Indian citizens are enshrined in Article 51A under Part IVA of the Constitution, having been introduced by the 42nd Amendment Act of 1976 [1]. Among the eleven duties currently listed, Article 51A(d) explicitly mandates every citizen 'to defend the country and render national service when called upon to do so' [3]. Other options provided in the question do not constitute Fundamental Duties. For instance, while citizens are encouraged to value and preserve the rich heritage of the country's composite culture, there is no specific duty to 'visit' monuments or 'know more' about religions [3]. Similarly, while the Directive Principles of State Policy (Article 51) promote international peace and security, providing friendly cooperation to neighboring countries is not listed as a Fundamental Duty for individual citizens [3].

Sources

1. [1] Introduction to the Constitution of India, D. D. Basu (26th ed.). > Chapter 8: FUNDAMENTAL RIGHTS AND FUNDAMENTAL DUTIES > Fundamental Duties. > p. 161
2. [2] https://api.sci.gov.in/pdf/AnnualReports/The%20Constitution%20at%2067.pdf
3. [3] https://dsel.education.gov.in/sites/default/files/Fundamental-Duties-English.pdf