Answer:
C. To explain the purposes of establishing a new government
Step-by-step explanation:
A preamble, is a statement that is used as an introduction before the actual content of a declaration/article.
The preamble of United States constitution is used by the Founding fathers to communicate their intentions of creating a separation between the colonies and the British government.
The preamble also mention a new set of laws that will act as the "higher law", which is the constitution. The constitution will serve as a foundation for the future laws that will be made in the new government. None of the future laws can violate the content of the constitutions in any way.