If the demand for a good or service increases, how will prices affect supply?

If the demand increases then it would usually result in the price going higher.

Explanation:

Because with more demand there isn't enough stuff to do to everyone.

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.

b) the planets year length would be longer

hope this !