Department of Homeland Security is most closely associated with the war on terrorism.
Option A
Explanation:
The terrorism is the greatest threat to the countries throughout the world. So, each country has formulated a special forces who can handle worst situation happened because of terrorism. A big country like America has been target of terrorism for quite some times.
So to protect and safeguard the people from the threats the Department of Homeland Security plays a major role in American society. This is the agency which has been designed in such a way to enforce law and order and crackdown the terrorism in their homeland.