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Capacitors are used in various electrical systems to smooth out and stabilize voltage levels. When included in the AC input of a solid-state drive, capacitors can help reduce fluctuations and distortions in the electrical signal. They act as temporary energy storage devices, absorbing excess voltage and releasing it when needed, which helps ensure a steady supply of power. This smoothing effect is crucial for sensitive electronic components like solid-state drives, which require stable voltage to operate effectively without data loss or drive failure.

While inductors, resistors, and transformers each have their roles in electrical systems, they do not directly function in the same way to mitigate distortion in the AC supply for solid-state drives. Inductors can help filter signals but are more effective in specific applications. Resistors typically dissipate energy rather than store it, and transformers are used for voltage conversion rather than stabilization of supply. Therefore, capacitors are the most suitable choice for preventing distortion in this context, making them the correct answer.