When one thing in the series connection of circuit, goes off, the whole circuit stops functioning.
Answer: Option B
Explanation:
The series connection lets the current flow in the unidirectional flow without distributing the current among the circuit.
It goes from one circuit to another with flow that is why if something goes wrong and the current is interrupted, the whole circuit goes nonfunctional.
It is unlike the parallel connection, where the current is distributed equally and hence do not interrupts if one thing stops working.