Answer:
By the use of millitary aircraft during 1948 - 1949.
Explanation:
By using millitary aircraft to supply West Berlin with food, medicines and basic necessities from 1948 to 1949.
C. Unit North and South Korean under a communist government
The estates-general parliament.
The Sahel was the last area in the northern parts of Africa, where vegetation can survive and where people were living at the time. Following the Sahel to the North one can find the Sahara desert which is a natural barrier that no invading force could trespass.
The WPB or War Production Board set the products that would be needed for war and they determined their pricing.
So I agree with you, the answer is A.
But I must admit I was a bit iffy between A and D but I'd still say that A is a better choice.
Hope this helped