What happens to the resistance in a circuit if a resistor with a high value is added?

When a resistor with a high value is added in a circuit, the overall resistance of the circuit increases. This is because resistors in series add their resistances together, resulting in a total resistance that is the sum of all individual resistances. When a new, high-value resistor is introduced, it contributes significantly to this total, causing a higher aggregate resistance in the circuit.

In contrast, if resistors were placed in parallel, the overall resistance could decrease, but that context is not part of this question. Here, it's specifically about adding a single, high resistance in series, which confirms that the total resistance rises. Therefore, the correct choice reflects the fundamental principle of resistance in series circuits.