The correct answer is option 4, "To promote international peace and security."

The Constitution of India lists the fundamental duties of citizens in Article 51A. These are the moral and civic obligations that every citizen is expected to fulfill. While options 1, 2, and 3 are all enumerated as fundamental duties, option 4 is not.

Option 1, "To safeguard public property," refers to the responsibility of citizens to protect and preserve public resources and assets. This duty emphasizes the importance of collective ownership and the need to prevent damage or destruction of public property.

Option 2, "To protect and improve the natural environment," highlights the duty of citizens to be environmentally conscious. It calls for the preservation and conservation of the environment, promoting sustainable practices, and working towards the improvement of the natural surroundings.

Option 3, "To develop the scientific temper and spirit of inquiry," emphasizes the importance of nurturing a scientific mindset among citizens. It encourages curiosity, critical thinking, and a rational approach towards understanding the world around us.

Option 4, however, is not listed as a fundamental duty. While citizens are encouraged to promote international peace and security, it is not explicitly mentioned in the Constitution. Alert - Correct answer should be "To promote international peace and security