Explanation: Radio-frequency (RF) amplifiers, especially those operating at higher frequencies, can experience unwanted feedback from their output to their input. This feedback typically occurs through parasitic capacitance within the active device (like a transistor's collector-to-base or drain-to-gate capacitance). If this internal feedback is sufficiently strong and in the correct phase (positive feedback), it can cause the amplifier to become unstable and spontaneously generate its own signal, leading to **sustained oscillations**. An amplifier that is oscillating cannot properly amplify an external signal. **Neutralization** is a technique used to counteract or cancel this internal feedback. By introducing a controlled amount of feedback that is equal in magnitude but opposite in phase to the unwanted internal feedback, neutralization stabilizes the amplifier, preventing it from oscillating. Therefore, option B is correct: Neutralization prevents sustained oscillations from occurring. * **A) To maintain linear operation:** While an oscillating amplifier certainly won't operate linearly, the primary and direct goal of neutralization is to prevent the oscillation itself. Linear operation is a consequence of a stable, non-oscillating amplifier. * **C) Sustain feedback:** Neutralization aims to *cancel* unwanted feedback, not sustain it. Sustaining feedback (positive feedback) is what *causes* oscillations.