In Terms of Its Relations with Neighboring Powers, the Song

In terms of its relations with neighboring powers, the Song

A) met their ultimate demise at the hands of the Mongols.
B) was able to maintain a permanent dominance over the Jin Dynasty of the Jurchens.
C) reconquered the northern region controlled by the Uighurs.
D) learned from the mistakes of the Tang and avoided a similar fate.
E) conquered Japan, the first time that this had happened.