Explanation: FM receivers are fundamentally designed to mitigate static interference, which is primarily amplitude-modulated noise. Here's why the answer leans towards FM and how the options can be interpreted: 1. **FM Receiver Immunity (Plausibility for "not respond" and option B):** FM (Frequency Modulation) receivers employ a limiter circuit that removes all amplitude variations from the incoming signal before the demodulator stage. Since static interference manifests as amplitude spikes, the limiter effectively clips these off, preventing them from being processed as part of the desired signal. Therefore, an FM receiver largely "does not respond" to the amplitude component of static interference. Option B, "FM receivers have better sensitivity to such interference," can be interpreted as having better *performance* or *rejection* of interference, allowing for clearer reception of weak signals even in noisy conditions—a key advantage of FM. 2. **AM Receiver Response:** AM (Amplitude Modulation) receivers, by contrast, decode information based on changes in the signal's amplitude. Static interference directly alters the amplitude of the received signal, so an AM receiver processes this noise as if it were part of the intended audio, making the static clearly audible and often overwhelming the desired signal. Thus, AM receivers *do* respond to static interference. 3. **"Both AM & FM" (Option C):** This part of the correct answer is problematic. Based on the above, only FM truly "does not respond" to the amplitude characteristics of static. For C to be considered correct, "do not respond" must be interpreted very loosely, perhaps meaning that neither receiver type completely ceases to function or goes silent in the presence of static, even if AM's output is heavily degraded. This is a highly charitable interpretation. Considering the common understanding in amateur radio, FM's inherent noise rejection (due to its limiter circuit and detecting frequency rather than amplitude changes) is the primary reason it handles static interference much better than AM. While option C is questionable, option B accurately reflects FM's superior performance in noisy environments. The combined answer D suggests a composite understanding, acknowledging FM's noise rejection and potentially a broad, albeit weak, interpretation of "not respond" for both types.