Answer:
The given picture shows a light bulb.
Step-by-step explanation:
The circuit diagram is the pictorial form to represent electrical devices. There are many elements of a circuit i.e. resistors, transistors, voltmeter, ammeter, switch etc.
In this case, we need to write the name of the given symbol. The electrical symbols are given in order to show the elements of a circuit. The given figure shows a light bulb.
Hence, the correct option is (b) "a light bulb".