Respuesta :
The terrorist group al-Qaeda used four airplanes to attack U.S. targets on September 11, 2001 and Option D is correct.
Which significant event happened on 9/11?
Four coordinated attacks were executed by Islamist extremist group known as al-Qaeda on the morning of September 11, 2001 in prominent locations of United States.
Four planes were used by the terrorist group al-Qaeda to attack U.S. targets on 9/11.
Therefore, option D is correct.
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