B. The Wright brothers . . .

The Peloponnesian War (431–404 BC) was an ancient Greek war fought by the Delian League led by Athens against the Peloponnesian League led by Sparta. Historians have traditionally divided the war into three phases. ... This period of the war was concluded in 421 BC, with the signing of the Peace of Nicias. Hope I helped! ☺
Answer:
The Black Death or The Plague broke out and killed 25 million or 1/3 of the continents population
Explanation:
This is <span>National Security Council
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1
I think you made a mistake
is it 2x=2
then the answer will be 1 because your going to divide