The principle of NON-INTERVENTION in the internal affairs of other States is rooted in Article 2(7) UN Charter and was affirmed by the ICJ in:

1. The ICJ in Nicaragua v. USA (1986), paras. 202-209, affirmed the principle of NON-INTERVENTION in customary international law. 2. The Court held: 'the principle of non-intervention forbids all States or groups of States to intervene directly or indirectly in internal or external affairs of other States. A prohibited intervention must accordingly be one bearing on matters in which each State is permitted, by the principle of State sovereignty, to decide freely. One of these is the choice of a political, economic, social and cultural system, and the formulation of foreign policy. Intervention is wrongful when it uses methods of coercion in regard to such choices, which must remain free ones.' 3. The principle is also reflected in the Friendly Relations Declaration (GA Res 2625(XXV), 1970). 4. Hence option B is correct. _Source: UN Charter 1945 / Vienna Convention on Law of Treaties 1969 / Geneva Conventions 1949 / ICJ Statute / UDHR ICCPR ICESCR — Military and Paramilitary Activities in and against Nicaragua, 1986 ICJ Rep 14, paras. 202-209_