Statistics for Historical Events - AD or BC?

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Question	Answer	% Correct
Columbus sails to the New World	AD	97%
William the Conqueror conquers England	AD	93%
Great Pyramid built in Egypt	BC	93%
Extinction of the Woolly Mammoth	BC	83%
First known summit of Mont Blanc, the highest mountain in the Alps	AD	82%
Construction of Stonehenge	BC	82%
Trojan War	BC	81%
Most recent time that Babylon was the largest city in the world	BC	78%
First written mention of the city of Moscow	AD	77%
Start of Islam	AD	75%
Invention of gunpowder	AD	73%
Human settlement of New Zealand	AD	69%
Birth of Alexander the Great	BC	68%
Birth of the Buddha	BC	66%
Assassination of Julius Caesar	BC	64%
Foundation of the Inca Empire	AD	61%
Invention of chess	AD	50%
First known heliocentric model of the solar system	BC	37%