Answers B and D.
Rebellions in Poland and Hungary were different mainly because Poland won some economic concessions but Hungary failed to accomplish some of the reforms they fought for.
Riots against the Soviet Union erupted in Poland in June 1956. Although the army controlled the rebellion, the Polish gained concessions from the USSR. The Communist party in Poland regain the economic control of the country but remained loyal to Moscow through the Warsaw Pact. Poland and Rusia maintained friendship ties.
In the case of Hungary, things were more complicated. People from Hungary demanded political reforms. Communist and students marched on the streets, demanding actions against the looting and violence by Russian troops in 1945.
Nikita Kruschev -Secretary of the Communist party in the USSR- removed the leaders of the ministry of Hungary. Prime Minister Imre Nagy abolished the one-party system and announced new elections, but Russia didn't like the idea because they considered the decision as a possible change to capitalism.