The correct answer is (a) Article-13.
Article 13 of the Indian Constitution states that all laws in force in the territory of India immediately before the commencement of this Constitution, in so far as they are inconsistent with the provisions of this Part, shall, to the extent of such inconsistency, be void.
This means that no law can be made that violates the fundamental rights guaranteed by the Constitution. The rule of law is one of the fundamental rights guaranteed by the Constitution. It means that everyone is subject to the law, including the government. The government cannot make laws that are arbitrary or discriminatory.
The other options are incorrect because they do not deal with the rule of law. Article 14 guarantees equality before the law. Article 15 prohibits discrimination on the grounds of religion, race, caste, sex, or place of birth. Article 16 guarantees equality of opportunity in matters of public employment.