Question

What will happen if Bulb A burns out?

Answer 1

When a light bulb burns out, its filament burns in two. Since the filament is part of the conducting path for the electricity flowing through the bulb, once the filament is broken, current can no longer flow through the bulb, and so it no longer gives off any light.

Answer 2

Then both b and c burn out because a is giving both electricity and it can’t work without both of them so therefore you would have to say b and c burn out with a