Answer:
B. Roman emperors and generals found each other over land.
C. The empire expanded to a size that was too large to effectively govern.
Step-by-step explanation:
Barbarian tribes did in fact invade Rome that is how they went out. Roman emperors and generals fought over land because, they all wanted to be the king of the entire empire. The empire was so large that it was impossible to govern and that is how it started to fall apart. Strong and competent rulers did not in fact remain otherwise Rome would still be standing today.