What Administrative Change Did Diocletian Institute for the Roman Empire

Multiple Choice

What administrative change did Diocletian institute for the Roman Empire?

A) He made Christianity the official religion of the empire.
B) He administered the empire without assistance from a civil or military bureaucracy.
C) He divided power between himself and four other rulers.
D) He divided the empire into four regions, each with its own prefect while he maintained authority.
E) He made no changes since the administration of the empire worked well.