Explanation: Class C amplifiers are biased well beyond cutoff, meaning the active device conducts for significantly less than 180 degrees of the input signal cycle (typically 90-120 degrees). This highly nonlinear operation results in very high efficiency, making Class C ideal for RF power amplifiers in applications like FM or CW, where the output tank circuit can reconstruct the full sine wave from the short pulses of current. In contrast: * **Class A** amplifiers are biased to conduct for the entire 360-degree input cycle, offering high linearity but low efficiency. * **Class B** amplifiers are biased exactly at cutoff, conducting for 180 degrees of the input cycle. * **Class AB** amplifiers are biased slightly above cutoff, conducting for slightly more than 180 degrees to reduce crossover distortion while maintaining good efficiency.