The correct answer is (a).
Article 393 of the Constitution of India states that “This Constitution may be called ‘The Constitution of India’.”
Article 390 states that “The Constitution shall be the supreme law of the land.”
Article 280 states that “There shall be a Council of Ministers with the Prime Minister at the head to aid and advise the President in the exercise of his functions.”
Article 101 states that “The President shall be elected by an electoral college consisting of the elected members of both Houses of Parliament and the elected members of the Legislative Assemblies of the States.”
Article 393 is the only article that explicitly states that the Constitution may be called ‘The Constitution of India’. The other articles do not mention this.