Which of the following is opposition to the flow of alternating current in an inductor?

In an inductor, the opposition to the flow of alternating current is called reactance (specifically, inductive reactance). As the AC signal changes direction, the inductor creates a changing magnetic field that induces a counter-electromotive force, pushing back against the current flow. While resistance opposes current in all conductors and turns energy into heat, reactance opposes AC current without dissipating power. Other terms like reluctance apply to magnetic circuits, and conductance or admittance are measures of how easily current flows, which is the opposite of opposition.