Analog signals are rich in detail but susceptible to this.

• A. Noise
• B. Attenuation
• C. Distortion
• D. Interference

Answer: (A)

Analog signals carry rich detail because they vary continuously, but that very continuity makes them vulnerable to random disturbances. Noise refers to those random, unwanted fluctuations that get added to the signal from sources like thermal activity in components, shot noise, or environmental effects. When noise is present, it blends with the desired signal, masking fine details and reducing the signal-to-noise ratio, which is why analog systems are said to be susceptible to it. Attenuation is just a reduction in signal level and doesn’t inherently introduce randomness. Distortion changes the waveform shape rather than adding random fluctuations, and interference is external signals that can cause problems but is encompassed by the broader idea of noise as random disturbance. So the best fit for “Analog signals are rich in detail but susceptible to this” is noise.