Answer :
The correct response that replaces the question mark on the list "U.S. Responses to the Terrorist Attacks on September 11, 2001" is:
- Conducted military operations in Afghanistan
After the terrorist attacks on September 11, 2001, the United States launched military operations in Afghanistan. This was in response to the Taliban regime in Afghanistan harboring and supporting the terrorist group Al-Qaeda, led by Osama bin Laden, who orchestrated the attacks on 9/11. The military operations aimed to dismantle Al-Qaeda and remove the Taliban from power in Afghanistan. The mission, known as Operation Enduring Freedom, began in October 2001 and resulted in the removal of the Taliban from government control.
This response is significant as it demonstrates the U.S. commitment to targeting terrorist groups and their supporters in order to prevent future attacks and promote global security. Conducting military operations in Afghanistan was a key part of the U.S. response to the 9/11 attacks, reflecting the country's determination to combat terrorism on multiple fronts.