Which of the following statements is true? A) All members of the executive branch are elected by the people.
B) The executive branch includes those who work for the Department of Energy.
C) As commander-in-chief, the president has sole authority to declare war.
D) The president must be a natural-born U. S. citizen and be at least 40 years old.

I think it is B. The executive branch includes those who work for the Department of Energy (DOE)

Explanation:

Process of elimination. The people elect the President and Vice President. Not all members of the executive branch are elected by the people. Cabinet members are appointed.  It is true that the executive has cabinet members from all agencies/departments represented. Those are chosen by the President himself. This answer may work. The commander-in-chief does not have the authority to declare war, that power is vested in Congress. Finally, the president must be a natural-born citizen and be at least 35 years old and not at least 40 years old.