Which of the following could be used to make the simplest circuit?

a. a battery and a wire

b. a battery, wire, and a switch

c. a battery, wire, and a light bulb

d. a battery, wire, switch, and a light bulb

The following that could be used to make the simplest circuit are a battery, wire, switch, and a light bulb. The answer is letter D. The battery provides the energy for the bulb to work. The wire provides a pathway for the electrons to move. The switch provides the open and close of the circuit.