The federal law enforcement agency that would have jurisdiction in the event of a terrorist attack similar to 9/11

• A. CIA
• B. FBI
• C. ATF
• D. DHS

Answer: (B)

The key idea is who leads a federal counterterrorism investigation in a major domestic attack. The FBI is the primary federal agency responsible for counterterrorism investigations in the United States, working through Joint Terrorism Task Forces that coordinate with state and local partners. While the Department of Homeland Security helps with prevention, protection, and information sharing, it does not take the lead in investigating and prosecuting the attack. The CIA focuses on foreign intelligence and would not typically lead a domestic investigation, and ATF handles firearms, explosives, and arson within a more specialized scope. So in a terrorist attack on the scale of 9/11, the FBI would be the lead agency guiding the investigative response.