Answer:
from what I understand it should be (b) seems more like it's to protect the statement
Answer:Due to the failures of the summits, the tension over Berlin INTENSIFIED. As a result, even more Berliners crossed to the West just in case Khrushchev closed the border. At night, East German troops built a barbed wire fence around Berlin and between East and West Berlin.
Explanation:
It would be on at 5PM MST.
Hope this helps!