Respuesta :
A hole was created in the Iron Curtain when Hungary opened its borders.
What is the Iron Curtain?
The Iron Curtain refers to border which separated Soviet Union and Eastern Europe from the Western European countries
The purpose was to seal off the dependent eastern and central European allies from open contact with the West.
Therefore, the Option B is correct.
Read more about Iron Curtain
brainly.com/question/1504116