What occurs when a light bulb burns out in a series circuit?

When a light bulb burns out in a series circuit, it creates an open circuit, which means that the path for current flow is interrupted. As a result, no electricity can pass through the circuit. In a series configuration, all components are connected one after another along a single path, so if any one component (like a light bulb) fails or burns out, the entire circuit is broken. Consequently, this stops the flow of current to all other components in the series, resulting in no electricity passing through the circuit.

This is why the other options do not apply. For example, the current cannot increase through the circuit, nor can the voltage remain constant or cause the other bulbs to light up brighter, because the open circuit prevents any current from flowing at all.