How does total resistance behave in a series circuit?

In a series circuit, the total resistance is calculated by simply adding together the individual resistances of each component in the circuit. This means that as you add more resistors in series, the total resistance of the circuit increases. Each resistor contributes its own resistance to the total, so the more resistors that are included, the higher the overall resistance becomes.

This principle is due to the fact that the current flowing through a series circuit has to pass through each resistor one after the other, which adds to the opposition to the flow of current. Therefore, the correct understanding is that total resistance in a series circuit indeed increases with the addition of more resistors, aligning perfectly with the answer selected.