The answer for this question is C. The Domino Theory. This theory states that if a country came under communist rule, its neighboring countries and regions would follow as well. This theory is what the US used as a reason to intervene in the different affairs of various countries to stop or prevent communism from spreading.
Explanation:
everything can be found in the picture
Answer:
it is like a secret code that you can use to talk to people when you don't want an enemy to find out your tactics.
Explanation:
B. population of the region
