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In an AC (alternating current) circuit, the relationship between voltage and frequency can be understood through the concept of reactance. Reactance, which affects the impedance of capacitive and inductive components, varies with frequency. For example, in the case of inductors, the reactance increases with frequency, leading to higher voltage drops across the inductor at higher frequencies. Similarly, capacitors exhibit lower reactance at higher frequencies, which can influence the overall voltage behavior in the circuit.

When discussing the relationship between voltage and frequency, if all other factors are held constant, an increase in frequency can indeed lead to an increase in voltage across components that exhibit reactance. Therefore, in specific contexts, particularly when looking at how voltage behaves in response to changes in the operating frequency of the circuit, it is often treated as a directly proportional relationship.

This relationship is critical for understanding how circuits behave under different frequencies, especially in applications involving transformers or when synchronizing systems that operate on AC power.

The other options do not accurately depict how voltage and frequency interact in the context of AC circuits, as the variations in reactance directly tie voltage and frequency together, demonstrating their proportional relationship.