Of the following,the one that accurately describes the uniqueness of the September 11,2001,attacks on the United States is that it was the:

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The September 11, 2001 attacks were the first time a foreign attack killed thousands of civilians on U.S. soil. While it was not the first time al Qaeda had attacked U.S. property or the first attack on the U.S. from a religious extremist group, it was a uniquely devastating and unprecedented event in terms of scale and impact. Additionally, U.S. government officials had been aware of al Qaeda prior to the attacks. Therefore, option D is the most accurate description of the attacks' uniqueness.

Of the Following,the One That Accurately Describes the Uniqueness of the September