The center of Hungary's counter-revolutionary movement was Budapest

Debrecen

Bratislava

Szeged​

Budapest

Explanation:

The center of Hungary's counter-revolutionary movement was BUDAPEST.

Budapest is the capital of Hungary, a country in the eastern part of Europe. It became the center of a counter-revolutionary movement that occurred in the year 1956. The counter-revolutionary movement happened when the people of Hungary moved against the imposed policies and practices of the Hungarian People's Republic and the Soviet Union policies.