The correct answer is B: Capacitor. A capacitor is the electrical component that stores energy in an electric field. Capacitors consist of two conductive plates separated by an insulator (dielectric), and they store energy in the electric field between the plates. Capacitors are fundamental components that store electrical energy. When voltage is applied, electric charge accumulates on the plates, creating an electric field in the dielectric. This stored energy can be released when needed. Capacitors are used for filtering, coupling, timing, power supply smoothing, and many other applications. They're essential in radio circuits for tuning, filtering, and blocking DC while passing AC signals.