Answer:
Correct answers are:
A. Dictatorship of the Roman emperors
B. Inefficiency of the Roman soldiers
Explanation:
Option A is correct because Roman emperors were rather incompetent. Their region was harsh and people didn't like them in general. That made internal problems in the country.
Option B is also correct because through time Roman army lost its stability and discipline. Many mercenaries were part of it, and this led to its inefficiency.
Option C is not correct as new capital that was created on the east was the source of stability on the East. But, Western Empire had its own problems.