Which principle emphasizes that states should not interfere in the domestic matters of other countries?

Explanation

Sovereignty is the principle that grants states the authority to govern themselves without external interference in their internal affairs. This concept is fundamental to international law and the structure of the modern state system, as reflected in the United Nations Charter. Pragmatic politics (A) refers to decision-making based on practical considerations rather than ideology. Non-involvement policy (B), or isolationism, involves avoiding engagement in international issues but does not specifically address internal non-interference. Option D is incorrect because sovereignty directly relates to the principle of non-interference.