The correct answer is Dr. B.R. Ambedkar Explanation & Key Takeaways: Directive Principles of State Policy: • The Directive Principles of State Policy are enumerated in Part IV of the Constitution from Articles 36 to 51. • The framers of the Constitution borrowed this idea from the Irish Constitution of 1937, which had copied it from the Spanish Constitution. • Dr. B R Ambedkar described these principles as “Directive Principles is a novel feature in a constitution framed for parliamentary democracy. Hence option 3 is correct. Related Concepts: • The Directive Principles along with the Fundamental Rights contain the philosophy of the Constitution and is the soul of the Constitution. • Granville Austin has described the Directive Principles and Fundamental Rights as the ‘Conscience of the Constitution. • K.M. Munshi referred to the preamble of the Constitution as the "Political Horoscope" • B. N. Rau was appointed the Constitutional Adviser to the Constituent Assembly in formulating the Indian Constitution in 1946. • 13 December 1946: An 'Objective Resolution' was presented by Jawaharlal Nehru, laying down the underlying principles of the constitution, which later became the Preamble of the constitution.