Exp) Option d is the correct answer.

Constitution of India is one of the lengthiest of all the written Constitutions of the world. It is a very comprehensive, elaborate and detailed document.

Statement a is correct. The Government of India Act of 1935 itself was a lengthy and detailed organic law. Many provisions in the Constitution of India were borrowed from that Act, because the people were familiar with the existing system.

Statement b is correct. While the Constitution of many federal countries like the United States deals only with the Federal Government and leaves the States to draw up their own Constitution. The Indian Constitution provides the Constitutions of both the Union and the Units (i.e., the States), with the same fullness and precision.

Statement c is correct. Constitution of India contains detailed provisions regarding the distribution of powers and functions between the Union and the States in all aspects of their administrative and other activities. Further provisions regarding inter-State relations, co-ordination and adjudication of disputes amongst the States are also there. The Constitution contains not only the fundamental principles of governance, but also detailed administrative provisions.

Statement d is incorrect. Representation of the People Act (RPA),1951 deals with the registration of political parties, while Representation of the People Act (RPA), 1950 deals with preparation of electoral rolls. Both acts enacted by parliament are statutory laws and are not the part of constitution.