Question

he division of the Roman Empire between east and west was an attempt to solve what problem? A. The difficulty of running such a large territory B. The difficulty of trading sailing vessels traveling from east to west C. A massive grain shortage in Egypt D. The growing hatred between eastern and western Romans

Answer 1

I agree with the other person - the correct answer should be  A. The difficulty of running such a large territory.
The Roman Empire was huge - it had many territories in Europe, North Africa, and the Middle East, so it encompassed such a large area that it was too difficult to govern smoothly. This is why it was split into two areas so as to make things easier. 

Answer 2

A. The difficulty of running such a large territory
Because of the external threads