To create a complete circuit through which an electric current can flow, you need a power source (like a battery or generator), conductive paths (like insulated wires), a load (like a buzzer or light bulb), and a closed switch to complete the circuit.
Let's analyze each option:
A. A battery, insulated wires, a buzzer, and an open switch - The open switch means the circuit is incomplete, so current cannot flow.
B. A generator, two light bulbs, and an open switch - Again, the open switch means the circuit is incomplete.
C. A generator, a light bulb, and a closed switch - This option has a closed switch, which means the circuit is complete. This allows current to flow.
D. A battery, insulated wires, and a buzzer - There is no switch mentioned, and without a switch, we cannot confirm if the circuit can be turned on or off. It might imply that the circuit could be complete, but it is not clearly stated.
The correct answer is C. A generator, a light bulb, and a closed switch.