d. The bulb will not light up.
What is a series circuit?
A series circuit comprises a path along which the whole current flows through each component.
According to the question,
When the switch is open, the light cannot operate since the circuit is not complete.
There is no closed-loop path for the current to flow through the circuit. When the switch is closed, the light bulb operates since the current flows through the circuit.
If the switch is open then the connection between the circuit broken and the bulb stops glowing.
For light up the bulb , the circuit needs to be closed and connected.
Only the circuit which have closed path will flows the current. It consists of cell , battery , wires, resistors etc.
Therefore,
The bulb will not light up, if a switch is open in a series circuit with a battery trying to light a bulb.
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