Which statements are true of the September 11, 2001, attacks against the United States? Choose four correct answers.

The attackers boarded four planes and took control after attacking the flight crews, so B is true. Many of the hijackers had received flight training in the United States, making C true. Two planes struck the World Trade Center towers in New York City, and the resulting fires—fed by burning jet fuel and other materials—contributed to the buildings’ collapse, so E and F are true. The planes were not remotely controlled, and airport security did not stop the attackers from boarding.

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