What is the purpose of the phrase "secure the Blessings of Liberty to
ourselves and our Posterity" in the Preamble to the U. S. Constitution?

A. To show that the people hold all political power in the country
B. To guarantee that the U. S. government will have separation of
powers
C. To place strict limits on the power of the U. S. federal government

D. To state that the government is expected to protect American
freedoms