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 of Terrorism that led to ongoing military engagements in Afghanistan and subsequently iraq. Clean-up and restorations efforts led to the rebuilding of Lower Manhattan, and federal grants supported the development of the National September 11 Memorial & Museum.
D is the answer because democracy was designed so the people would have a say in what the City State is doing and how they are doing it. It was made so the government would not have leading control. It gave the common people a say.