ASVAB Armed Services Vocational Aptitude Battery (#77)

Section: Mechanical Comprehension

In the water system shown below, assume that the main tank starts empty and that all the valves are closed. In order for the tank to fill about halfway and keep that level, which valves have to be open?

Valves A, B, and C.
Valves A, B, and D.
Valves A, E, and B.
Valves A, E, and C.