Final answer:
Adding two more light bulbs in parallel to an existing circuit does not affect the brightness of other bulbs, as each bulb gets its current directly from the power source without influencing the others. OPTION C IS ANSWER
Step-by-step explanation:
When adding more light bulbs in parallel to a circuit, each new light bulb does not affect the brightness of the others. Therefore, the correct answer is c) No effect on brightness. When light bulbs are added in parallel, they each have their own separate path to the power source. This arrangement ensures that each bulb can draw the current it needs directly from the power source without affecting how much current flows through the other bulbs.
In a series circuit, adding additional bulbs reduces the brightness of all bulbs because they all share the same current. However, for parallel circuits, this is not the case as each bulb operates independently.
The scenario described in the question of adding two more bulbs does not lead to a short circuit since each bulb is added in parallel and still maintains the continuity of the electric circuit. OPTION C IS ANSWER