Answer: A. To prevent another world war.
Step-by-step explanation:
The United Nations was founded in 1945 after World War II with the primary goal of promoting international peace and security to prevent future global conflicts. Its establishment aimed to provide a platform for countries to cooperate, resolve disputes peacefully, and work together on issues of common interest. While the United Nations has since expanded its mandate to encompass various areas such as human rights, development, and humanitarian assistance, its original purpose was rooted in preventing the recurrence of devastating world wars.