Answer:
C. Primary or Secondary sources related to the event.
Explanation:
A historian using primary or secondary resources related to the events is the most reliable.
Population moved from rural areas into cities.
The first choice: The French Navy cut off supplies and a way to escape for the British Army. In addition American and French ground forces well outnumbered British forces.
The Xiognu brutally conquered other nomadic tribes, often killing their leaders and forcibly incorporating them into the Xiongnu state. This created resentment among the various conquered peoples, which, coupled with some uncertainty regarding an heir to the throne, led to a civil war in the Xiongnu state from 60-53 BC.