<em>D. </em><span><em>Rome could not grow enough food and maintain a large enough army to fend off barbarian tribes.</em>
<em>It is true Rome could not grow enough food and maintain a large army because of the barbarian tribes. Non of theses answers would be true but D.</em>
<em>I hope this truly did help!</em></span>
Answer:
It is the USA's branch of government that makes the laws of the country.
Less based around slavery