Solution:International politics during the Cold War period can be characterized as bipolar. This era was defined by the rivalry between two superpowers, the United States and the Soviet Union. Each superpower led its own bloc of allies:the US with NATO and the Soviet Union with the Warsaw Pact. This division created a clear bipolar structure in international relations.
Unipolar and multipolar structures do not apply, as they suggest either a single dominant power or multiple competing powers, respectively. Polycentric implies multiple centers of power without a clear dominant pair, which was not the case during the Cold War.