Step 1: Understand the objectives from the UN Charter.
Article 1 of the UN Charter lists the primary purposes of the United Nations.
Step 2: Analyze the options based on the Charter.
(A) Maintenance of international peace and security: This is the very first and most important objective listed in Article 1(1).
(B) Ensuring respect for treaty obligations: The Preamble of the Charter mentions establishing conditions under which justice and respect for the obligations arising from treaties can be maintained.
This is a core objective.
(C) Protection of fundamental human rights: Promoting and encouraging respect for human rights and for fundamental freedoms is another key objective mentioned in Article 1(3).
(D) Establishment of democratic court throughout the world: This is NOT an objective of the UN.
While the UN has its own principal judicial organ (the ICJ) and supports international justice, it does not have the mandate or objective to establish a specific type of court (like a "democratic court") in every country.
This would violate the principle of state sovereignty.