B. Because even with many issues that plagued the Roman Empire economically and politically, By the later years of the empire the Roman military was mainly comprised of trained Barbarian soliders who were inferior to earlier Roman soliders causing a significant decrease in the Roman Empires's Military capablities so many barbarian tribes that began to grow such as the Huns, Vandals, Goth etc. Put immense pressure on the Empire, driving them into the ground economically and causing many issues within the government and eventually being sacked, thus marking the end of the Roman Empire. Sorry for the wall of text but hope this helped :)
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.
It is D i’m pretty sure at least i’m in between B and D
Answer:
King - The top leader in the land was the king. The king could not control all of the land by himself, so he divided it up among the Barons. In return, the Barons pledged their loyalty and soldiers to the king. When a king died, his firstborn son would inherit the throne.