The correct answer should be C!
Answer:
On December 25, 1991
Explanation:
The Soviet hammer and sickle flag lowered for the last time over the Kremlin, thereafter replaced by the Russian tricolor. Earlier in the day, Mikhail Gorbachev resigned his post as president of the Soviet Union, leaving Boris Yeltsin as president of the newly independent Russian state.
The correct answer should be the Achilles' heel. Achilles had his heel as his weak spot and died after being hit with an arrow there.
The Protestant Reformation is the answer.