Answer:
The Berlin Blockade of 1948 to 1949 marked the beginning of the Cold War, the building of the Berlin Wall in 1961 represented the high point of tensions and the opening of the Wall in 1989 represented the end of Cold War tensions.
I think the answer is C! I may be wrong but the rest don't seem accurate to the history. Good luck!
when promised to do so
Explanation:
