The Song of Roland Is Useful for Historians Because It

The Song of Roland is useful for historians because it:

A) provides much information about the reign of Charlemagne.
B) reflects the culture of the time in which it was written.
C) reflects the culture of Charlemagne's court.
D) provides much information about how battles were fought in the ninth century.
E) reflects Charlemagne's dedication to chivalry.