Question

What is the purpose of the phrase "We the People of the United States in the

Answer 1

Answer:

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

So I would say the answer is B. To explain that the U.S. government has a duty to protect its  people.