Which of the Following Was the Reason for the Roman

Which of the following was the reason for the Roman defeat at Adrianople?

A) Valens was unwilling to wait for Gratian's troops before he began the battle.
B) The Huns pressured the Goths to move into Roman territory.
C) Alaric united and led several Gothic tribes.
D) Gratian failed to supply Valens with sufficient troops to fight.
E) Logistical problems caused the Roman army to need to fight before the situation was ideal.