The correct answer is C: Inductor. An inductor is the type of electrical component that stores energy in a magnetic field. Inductors are coils of wire that create magnetic fields when current flows, storing energy in that magnetic field. Inductors are coils of wire (often wound around a core) that store energy in a magnetic field. When current flows through the coil, it creates a magnetic field around it. This magnetic field stores energy. When the current changes, the magnetic field changes, inducing voltage (inductance). Inductors are used for filtering, tuning, impedance matching, and many RF applications. They're essential in radio circuits for resonant circuits, filters, and impedance transformation.