The correct option is C To defend the country and render national service when called upon to do so
The Fundamental Duties were added to the Constitution by the 42nd Constitutional Amendment Act, 1976 and one more duty was added in 2002 by the 86th Constitutional Amendment Act. These serve as a reminder for the citizens as the duty they owe towards nation, society, and Constitution while enjoying their Rights. It is given in Part IV-A, Article 51A.