A simple circuit consists of a battery, a light bulb, a capacitor, a switch, and some wire. When the switch is turned on, electrical potential energy is produced. What causes that potential?

a
The switch adds energy to the system through mechanical transmission of energy.

b
The electrons are removed from one side of the capacitor and moved to the other side.

c
The light bulb runs continuously, adding luminous energy to the area.

d
The current running through the wire causes it to heat up, raising the resistance of the wire.