The answer is 2: to increase the amount of land available for agriculture.
Reason:
If I remember correctly from Geography last year that is called terrace farming. Common practice in hilly areas where you would be unable to plant crops. Instead, they flatten that out and have “steps” that gives them flat land to grow crops, often rice.
Why did the US airlifted supplies into west Germany for over a year because of the Berlin Wall. Truman ordered a massive airlift of supplies into West Berlin as an effort to avoid WWII. On June 26, 1948, the first planes took off from bases in England and western Germany and landed in West Berlin. For nearly a year, American planes landed around the clock.
I hope this helped.
Ok, so if done that before. Its all in your sections! (meaning read)
I know this might not be what your looking for but, its all in your work!
(btw we use the same schooling platform)