What is the purpose of the phrase "establish justice, insure domestic tranquility, and provide for the common defense" in the constitution's preamble
A) to guarantee that the american people will get to vote on all new laws
B) to show that the people hold all the political power in the new country
C) to explain that the U.S. government has a duty to protect its people
D) to claim that the new Constitution can be changed over time