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Answer:
On this day in 2001, 19 militants associated with the terrorist group al-Qaeda hijacked four planes in the united States, crashing three into buildings(the fourth crashed into Pennsylvania) and killing about 3,000 people.
The date "Sep 11, 2001" was a significant date in US history because it was when the Al-Qaeda carried out the largest terrorist attack against the United States.
What is the 9/11 attack?
It was when the Al-Qaeda group under Osama Bin Laden hijacked the Airplane and crashing into the Word trade center in New York.
Hence, it was a significant date in US history because it was when the Al-Qaeda carried out the largest terrorist attack against the United States.
Therefore, the Option A is correct.
Read more about 9/11 attack
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