Answer:
to discourage the use of flight to travel between cities?
hope this helped if its not c then maybe d?
The country credited is China.
The South could produce all the food it needed, though transporting it to soldiers and civilians was a major problem. The South also had a great nucleus of trained officers. Seven of the eight military colleges in the country were in the South. The South also proved to be very resourceful.
Hope it helps you
