Which one of the following Directive Principles is related to Foreign Policy?

The Directive Principles of State Policy (DPSP), laid down in Part IV (Articles 36-51) of the Constitution, are non-justiciable guidelines that direct the State's policy across distinct domains — social welfare, economic organisation, environmental protection, and India's conduct in world affairs.

Article 51 specifically directs the State to promote international peace and security, maintain just and honourable relations between nations, foster respect for international law and treaty obligations, and encourage settlement of international disputes through arbitration — this is the DPSP article that governs India's Foreign Policy.

• Article 50 requires the State to take steps to separate the judiciary from the executive in the public services — an institutional/administrative principle, not a foreign-policy one.

• Article 49 obliges the State to protect monuments, places, and objects of national, artistic, or historic importance — a heritage-conservation principle, unrelated to foreign policy.

• Article 48 directs the State to organise agriculture and animal husbandry on modern, scientific lines — an economic and rural-development principle, unrelated to foreign policy.

Hence, among the given options, only Article 51 corresponds to the Directive Principle related to Foreign Policy.