Answer:
C. an attempt to overthrow communist rule in Hungary
Explanation:
The Hungarian flag was bearing the Rakosi coat of arms, reflecting the communist rule in Hungary. The Hungarians though despised the Soviets and being under their control, so they made a revolution. The Hungarian Revolution had its own flag, and the flag was totally the same, apart from the Rakosi coat of arms being cut off from it, thus having a white gap in he center. The meaning of this feature on the flag was that the Hungarians want to overthrow the communist rule in the country, and that the communism and the Soviet rule doesn't have place in their society.
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Magellan proved Columbus' theory about the shape of the earth. He found an impractical water route to India. He also died before the journey was completed. The only thing that is not true is that Magellan sailed through the Isthmus of Panama.
He created a statue of Bacchus.