The statement "insure domestic tranquility" would remind the states to work together cooperatively because they are the governing entities that can help to prevent domestic conflict.
They both restraint in their portrayal of human emotions
Set a, set b, and set c all have like terms
Drafted and adopted by the Congress in 1777 but not ratified until 1781, it effectively established the U.S. as a collection of 13 sovereign states, each of which had an equal voice in Congress (which became officially known as the Congress of the Confederation) regardless of population.