【正确答案】 B

【答案解析】[听力原文] Security is a top concern in the capital of Central African Republic. After the US ambassador and its diplomatic team were evacuated on fears rebels could try to take the capital. The president of Central African Republic is calling for international help to fend off those rebels who are quickly seizing territory in the country. 由新闻第二句After the US ambassador and its diplomatic team were evacuated on fears rebels could try to take the capital可知，选项B正确。