The correct answer is: A. Defense
DARPA, or the Defense Advanced Research Projects Agency, is a research and development agency of the United States Department of Defense. It is responsible for the development of new technologies for use by the military. DARPA has funded a great deal of American Artificial Intelligence research, including the development of the first self-driving car.
The other options are incorrect. The Department of Energy is responsible for the nation’s energy policy and research. The Department of Education is responsible for the nation’s education system. The Department of Justice is responsible for the enforcement of the law.