The correct answer is C. Peace!
The United Nations (UN) is an international organization founded in 1945 after the Second World War by 51 countries committed to maintaining international peace and security, developing friendly relations among nations and promoting social progress, better living standards and human rights. Due to its unique international character, and the powers vested in its founding Charter, the Organization can take action on the issues confronting humanity in the 21st century, such as peace and security, climate change, sustainable development, human rights, disarmament, terrorism, humanitarian and health emergencies, gender equality, governance, food production, and more.
The UN’s motto is “Peace!”. This motto was adopted by the UN General Assembly in 1948. The motto reflects the UN’s commitment to promoting peace and security around the world.
The other options are not the motto of the UN. Option A, “It’s your world!”, is a slogan that was used by the UN in the 1990s. Option B, “Life for All!”, is a slogan that was used by the UN in the 1970s. Option D, “Love and Peace!”, is a slogan that is often used by peace activists.