1. **Problem Statement:** We have two circuits each with two bulbs connected to a battery. In the left circuit, bulbs A and B are connected in series. In the right circuit, bulbs C and D are connected in series. Bulb B in the left circuit and Bulb D in the right circuit are disconnected. We need to determine how this affects bulbs A and C. 2. **Understanding Series Circuits:** In a series circuit, the current flows through each component one after another. If one bulb is disconnected or removed, the circuit is broken and current stops flowing. 3. **Effect on Bulb A (Left Circuit):** Since bulbs A and B are in series, disconnecting bulb B breaks the circuit. No current can flow through bulb A. 4. **Conclusion for Bulb A:** Bulb A will go out because the circuit is open and no current flows. 5. **Effect on Bulb C (Right Circuit):** Similarly, bulbs C and D are in series. Disconnecting bulb D breaks the circuit. 6. **Conclusion for Bulb C:** Bulb C will also go out because the circuit is open and no current flows. **Final answer:** - Bulb A: Goes out because disconnecting bulb B breaks the series circuit. - Bulb C: Goes out because disconnecting bulb D breaks the series circuit.