Electrons carry energy from a battery to a lightbulb.

what happens to the electrons when they reach the lightbulb?
the electrons are emitted as light.
the electrons stay in the lightbulb.
fewer electrons leave the bulb than enter it.
the electrons are used up.
none of the above.

None of the above.

Explanation:

In a lightbulb, electrons at higher potential energy enter the lightbulb and give off that energy as they pass through the bulb. The number of electrons exiting and entering the bulb is the same. As electrons pass through the lightbulb, heat is produced due to the current,  this makes the filament of the lightbulb to incandescence, and that is the light we see.