The Preamble is the introduction to the Constitution. It lays out the goals that the Constitution was meant to achieve
The phrase is “Quantum Meruit”.
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.