Answer: Choice B) It is the newest executive department
This executive department was formed in 2002 after the events of 9/11. It cannot be the oldest executive department as other departments were well established by this point. No other executive departments had been formed after 2002. Therefore it is the newest created. The largest executive department is the department of defense, so that rules out choice C. Choice D is also ruled out because the department of defense budget is massive compared to the other departments.