The correct answer is A) securte the blessings of liberty to ourselves and our posterity.
The idea described in letter B was not in the Constitution. Rather it is the concept known as "manifest destiny." This term was not coined until the late 19th century, over a century after the creation of the Constitution.
The goal of the new US Constitution was to create a stronger connection between states, as the previous constitution failed to oragnize these states effectively.
The Declaration of Independence is the document that established Americas independence from Great Britain, not the US Constitution.
This shows that only letter A can be correct.