The correct answers are B) to introduce the document and C) to establish the purpose of the government.
The purpose of the Preamble to the Constitution is to introduce the document and to establish the purpose of the government.
The first 52 words of the US Constitution is known as the "Preamble." It serves as an introduction to the ideas approved during the Convention of September 17, 1787. In the Preamble, we can read that "We, the People," are the ones adopting the ideas stated in the next pages and the reason why we are adopting them.