An ideal battery, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?
(A) 30 V
(B) 40 V
(C) 60 V
(D) 70 V
(E) 110 V
