Which of the following is a light duty aircraft cleaning agent?

The correct answer is synthetic detergent, which is specifically formulated to serve as a light-duty cleaning agent. Synthetic detergents are effective at breaking down dirt, oil, and grease without being harsh on surfaces. They're typically designed to be used on aircraft surfaces, including painted areas and plastics, as they provide a gentle cleaning action while still being effective.

When considering other options, solvents and degreasers are generally stronger cleaning agents that may contain harsh chemicals capable of damaging aircraft surfaces or requiring more extensive safety precautions. Emulsions can be effective in certain cleaning scenarios but are not primarily categorized as light-duty agents like synthetic detergents. Therefore, synthetic detergents are the preferred choice for light-duty aircraft cleaning applications, ensuring safety and effectiveness.