From the items listed, which three should be readily available during emergency reclamation operations?

The correct choice emphasizes the importance of having specialized equipment readily available during emergency reclamation operations. A dry nitrogen source is essential for purging fuel systems or pressurizing components to prevent contamination. A 55-gallon drum can be crucial for collecting hazardous materials or waste during cleanup to ensure they are safely stored and removed. A dry air source is equally vital, as it can be used to pressurize systems or for drying wet components, which is important in preventing corrosion and ensuring equipment is operationally safe.

Having these items on hand directly supports the immediate and effective management of hazards that may arise during reclamation operations, promoting safety and efficiency in response activities. Other options, while they do include necessary emergency items, do not specifically target the needs of reclamation in the context of aviation or equipment preservation, which is crucial during operations to mitigate corrosion and maintain airworthiness.