Which of the following best expresses the central idea of the text?

A
The terrorist attacks on 9/11 inspired a new generation of Americans to fight for their country.
B
The report about the attacks on 9/11 revealed that the United States was not prepared to defend itself from an attack from the air.
C
The attacks on 9/11 led to the United States’ war on terror, which significantly changed American society.
D
The war on terrorism was a success because Osama bin Laden was killed in a raid by Navy SEALs in May 2011.