Which statement best describes what happened when Constantine tried to establish "New Rome"?

A- He brought the Western Empire under his control and established an empire in Italy that prospered.

B- He was not able to establish "New Rome" because Western Rome's armies were too strong and maintained control.

C- He was overthrown by a foreign prince, and his new empire crumbled under the prince's poor leadership.

D- He was successful in building a new political center in the East, unified by the Christian religion.