Increased threats from invaders forced Emperor Aurelian to take which of the following steps?

He divided the empire in half so that it would be easier to defend.
He had a wall constructed to protect the city of Rome from invasion.
He raised taxes so that he could hire more troops for the army.
He moved the capital to Constantinople, which was harder to attack.

Question

Increased threats from invaders forced Emperor Aurelian to take which of the following steps?  
  
 He divided the empire in half so that it would be easier to defend. 
 He had a wall constructed to protect the city of Rome from invasion. 
 He raised taxes so that he could hire more troops for the army. 
 He moved the capital to Constantinople, which was harder to attack.

anonymous · Answer

He divided the empire in half so that it would be easier to defend