Inside the battery

What is the effect of the battery in the circuit?

If the two cells of the battery are connected with a conductor, the charges can move.

In what way do the charges move through the electric line while the battery is being discharged?

The charges transit the light bulb.	The negative and positive charges meet at the light bulb.
All of the negative charges of the battery flow to the light bulb.	The negative charges of the lower cell are used up in the light bulb.