The fundamental duties, as enshrined in the Constitution of India, are a set of moral obligations for citizens. They were originally not a part of the Constitution but were added by the 42nd Amendment Act in 1976.

Option 1 states that the fundamental duties were not originally a part of the Constitution, which is correct. They were added later.

Option 2 states that safeguarding public property and abjuring violence are fundamental duties, which is correct. These duties aim to promote respect for public property and maintain peace and harmony in society.

Option 3 states that the fundamental duties are not enforceable through writs. Writs are legal orders issued by the court to protect the fundamental rights of individuals. However, fundamental duties are not enforceable through writs as they are moral obligations, not legally enforceable rights.

Option 4 states that the fundamental duties may not be used for determining the constitutionality of laws. This statement is correct. Fundamental duties do not have a direct impact on determining the constitutionality of laws. They are separate from fundamental rights and the process of constitutional review.

In conclusion, all the given options are correct except for option 4, which is not correct. The fundamental duties may not be used for determining the constitutionality of