Concept:
The Directive Principles of State Policy (DPSPs) are guidelines provided in Part IV (Articles 36--51) of the Constitution of India. They are intended to establish social and economic democracy and guide the State in making laws and policies.
• DPSPs are non-justiciable, meaning they cannot be enforced in a court of law.
• They aim to establish a welfare state.
• They guide the government in framing policies for social and economic justice.
Step 1: Identify the source of DPSPs.
While drafting the Indian Constitution, the Constituent Assembly borrowed several features from different countries.
The Directive Principles of State Policy were inspired by:
\[
\boxed{\text{The Constitution of Ireland}}
\]
Step 2: Recall other borrowed features.
Some important constitutional borrowings are:
• UK -- Parliamentary System, Rule of Law.
• USA -- Fundamental Rights, Judicial Review.
• Ireland -- Directive Principles of State Policy.
• Germany -- Emergency provisions (through the Weimar Constitution).
Step 3: Eliminate incorrect options.
• Germany -- Emergency provisions.
• UK -- Parliamentary form of government.
• Ireland -- Directive Principles of State Policy (Correct).
• USA -- Fundamental Rights and Judicial Review.
Step 4: Final conclusion.
Hence, the correct answer is:
\[
\boxed{\text{Ireland}}
\]