The correct answer is B. All of the choices are correct.
Step-by-step explanation
The United Nations is an international organization founded in 1945 after the Second World War, initially it was made up of 51 countries that pledged to maintain peace, international security, and the non-repetition of acts such as those that occurred during the war. This organization was initially created to participate as an intermediary in disputes between countries. Later, the organization has participated in different social issues such as poverty, education, health, independence of communities, among others. Therefore, the correct answer is B. All of the choices are correct.