Answer:
B. Form a more perfect union
Step-by-step explanation:
To form a more perfect Union is defined or explained to mean that the people of the United States are now forming a better agreement among themselves in comparison to Articles of Confederation that is generally considered as "a firm league of friendship."
This statement was also reaffirmed by Abraham Lincoln during the American civil war, to proclaim the unlawfulness of any state trying to secede from that Union.