Question

name: __________ date: __________

1. what happened on september 11, 2001?

a. the national september 11 memorial and flight 93 national memorial opened.
b. lawmakers created the department of homeland security.
c. u.s. forces invaded the nation of afghanistan, searching for osama bin laden.
d. terrorists hijacked airplanes and attacked the united states.

Explanation:

• Option A: The National September 11 Memorial opened in 2011, and Flight 93 National Memorial opened in 2015, so A is incorrect.
• Option B: The Department of Homeland Security was created in 2002, not on September 11, 2001, so B is incorrect.
• Option C: U.S. forces invaded Afghanistan in October 2001, not on September 11, 2001, so C is incorrect.
• Option D: On September 11, 2001, terrorists hijacked four airplanes and carried out attacks on the United States (World Trade Center, Pentagon, and a failed attack on a target in Pennsylvania), so D is correct.

Answer:

D. Terrorists hijacked airplanes and attacked the United States.