US growth accelerated during this time "<span>b. during the industrial Revolution". The United States along with Great Britain was one of the power houses of the Industrial Revolution, which increased output and subsequently GDP greatly. </span>
I believe the correct option would be a. Industrial resources
"He built a second capital in the East, which led to the division of the Empire" would be the best way to describe how Diocletian affected the Roman Empire, since it had grown to a state where managing it under a single entity was too difficult.
It is either B or C I honestly believe the answer is B tho.