Final answer:
The correct answer is that the lost boys were fleeing the Sudanese Civil War, and the US agreed to take them in and grant them asylum.
Step-by-step explanation:
The best answer that describes the connection between the Sudanese Civil War and the boys' arrival in the United States is that b) the boys were fleeing the war, and the US agreed to take them in. As a result of the conflict, many Sudanese children were displaced and ended up in refugee camps in neighboring countries. Eventually, a significant number were granted asylum and resettled in the United States, given their vulnerable status and the humanitarian crisis unfolding due to the prolonged civil war.