Step 1: Understanding the Question:
The question asks which country's constitution served as the source from which the framers of the Indian Constitution borrowed the concept of the Directive Principles of State Policy.
We need to identify the country among Ireland, Switzerland, the United Kingdom, and the United States of America.
Step 2: Detailed Explanation:
• The concept of Directive Principles of State Policy was borrowed from the Irish Constitution of 1937.
• The Irish framers had themselves borrowed this concept from the Spanish Constitution.
• These principles are intended to act as a guide for the executive and legislature in policy-making, aiming to create a welfare state.
• In contrast, the United States of America was the primary source for the Fundamental Rights (Bill of Rights), judicial review, and the independence of the judiciary, making Option (D) incorrect.
• The United Kingdom was the source for the parliamentary system of government, rule of law, bicameralism, and single citizenship, making Option (C) incorrect.
• Switzerland did not serve as the source for DPSPs, making Option (B) incorrect.
• Thus, Ireland is the correct country of origin for the Directive Principles in our Constitution.
Step 3: Final Answer:
The Directive Principles of State Policy were borrowed from the Constitution of Ireland, which is Option (A).