Final answer:
The stated purpose of the Department of Homeland Security is to secure the homeland from terrorist attacks.
Step-by-step explanation:
Among the choices provided, the one that represents one of the stated purposes of the Department of Homeland Security is option b) to secure the homeland from terrorist attacks. The Department of Homeland Security was created in response to the events of September 11, 2001, with an objective to unify and improve cooperation among various federal law enforcement agencies and prepare for, prevent, and respond to domestic emergencies, particularly terrorism. This consolidation of control is evidenced by its authority over a multitude of agencies including the U.S. Coast Guard, the Secret Service, and U.S. Customs. The need for an effective, coordinated response was further highlighted by the issues faced during Hurricane Katrina, embodying the Department's wider role in federal disaster response.