The United Nations was formed as a result of a common fear that another world war would destroy all of humanity.

B
fear that communism would spread through all of Europe and beyond.

C
the use of propaganda during World War I.

D
countries avoiding destructive wars.

D

Explanation:

I believe it is D countries avoiding destructive wars

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.