The best explanation why the area between Spain and Gaul was not part of the Roman empire until that later period was a culmination from both undesireability and difficulty in accessing this region due to its mountaineous nature. So I would wager the answer being both C and D - undesireability and difficulty in access.
Answer: 30
Explanation: I can't really explain it
The Chinese communes referred to in this 1961 cartoon are most closely associated with the Great Leap Forward.
