Answer:
security forces
Explanation: we changed how people got through security at the airport. we also made it harder for people to get in the cockpit of the aircraft we now have f-16s ready to go fully armed in case it happens again.After the September 11, 2001 attacks, the U.S. government responded with immediate action (including rescue operations at the site of the World Trade Center and grounding civilian aircraft), and long-term action, including investigations, legislative changes, military action and restoration projects. Investigations into the motivations and execution of the attacks led to the declaration of War on Terrorism that lead to ongoing military engagements in Afghanistan and subsequently Iraq. Clean-up and restoration efforts led to the rebuilding of Lower Manhattan, and federal grants supported the development of the National September 11 Memorial & Museum.Immediately after opening the hunt on Osama bin Laden, President Bush also visited the Islamic Center of Washington and asked the public to view Arabs and Muslims living in the United States as American patriots.[8]
Congress passed and President Bush signed the Homeland Security Act of 2002, creating the Department of Homeland Security, representing the largest restructuring of the U.S. government in contemporary history. Congress passed the USA PATRIOT Act, stating that it would help detect and prosecute terrorism and other crimes. Civil liberties groups have criticized the PATRIOT Act, saying that it allows law enforcement to invade the privacy of citizens and eliminates judicial oversight of law-enforcement and domestic intelligence gathering. The Bush Administration also invoked 9/11 as the reason to have the National Security Agency initiate a secret operation, "to eavesdrop on telephone and e-mail communications between the United States and people overseas without a warrant."[9]
On June 6, 2002, Attorney General Ashcroft proposed regulations that would create a special registration program that required males aged 16 to 64 who were citizens of designated foreign nations resident in the U.S. to register with the Immigration and Naturalization Service (INS), have their identity verified, and be interviewed, photographed and fingerprinted. Called the National Security Entry-Exit Registration System (NSEERS), it comprised two programs, the tracking of arrivals and departures on the one hand, and voluntary registrations of those already in the U.S., known as the "call-in" program. The DOJ acted under the authority of the Immigration and Nationality Act of 1952, which had authorized a registration system but was allowed to lapse in the 1980s because of budget concerns.[10][11] Ashcroft identified those required to register as "individuals of elevated national security concern who stay in the country for more than 30 days. source wiki
Fighting began in Lexington and concord when British troops came to arrest colonial leaders and take colonial weapons
I think it is D but I could be wrong.
