What is sustainability, and why is it so important in the 21st century?

Answer and Explanation:

Sustainability  is the ability to be maintained at a certain rate or level. I believe it's important because of long-term success for companies that have not succeeded in sustainability...

the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.

answer; proximity;