Final answer:
In a parallel circuit with individual switches for each bulb, turning off one switch leads to that specific bulb turning off without affecting the brightness of the others. The master switch controls all lights, turning them all off when switched to the off position.
Step-by-step explanation:
The student's question involves drawing a parallel circuit with two batteries, three light bulbs, individual switches for each light bulb, and a master switch for the entire circuit. In a parallel circuit, each component is independently connected to the voltage source. If one of the light bulb switches is turned off, only that specific light bulb will turn off (Option B), due to the independent paths for current flow in a parallel circuit layout. The brightness of the other light bulbs will not change; they will remain at the same brightness level since each bulb is connected to the full voltage of the source. If the master switch is turned off, then all lights turn off (Option A), as the master switch controls the complete circuit. The individual switching off of a light bulb does not affect the other components in a parallel circuit. Therefore, when one of the individual switches is turned off, it will not result in the remaining lights becoming brighter (Option C), nor will it cause the master switch to turn off automatically (Option D).