Only one setup below will light the bulb. Which setup will light the bulb?

The setup that will light the bulb in the given different circuit diagram is circuit A, because it is the only circuit is that is closed.
A complete circuit or closed circuit is the circuit that will allow the flow of electric current through it.
When a circuit is closed or complete, the connection of the different components of the circuit is complete.
From the image given, only option A has complete connection of different components of the circuit.
Thus, the setup that will light the bulb in the given different circuit diagram is circuit A, because it is the only circuit is that is closed.
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