What tool is primarily used to lift and move heavy loads?

The correct choice for the tool primarily used to lift and move heavy loads is the tugger. A tugger is designed specifically for the purpose of pulling and transporting heavy materials or equipment, often in industrial or manufacturing settings. It usually consists of a motorized system that can easily maneuver large loads, making it an essential tool for safe and efficient handling of heavy items.

In contrast, a manifold is a component used in various systems to distribute or collect fluids; it isn't used for lifting. A pipe tap is a tool designed for cutting threads into the ends of pipes, not for lifting loads. A ratchet is primarily used for tightening or loosening fasteners and does not serve the purpose of moving or lifting heavy objects. Thus, the tugger stands out as the most relevant tool for lifting and moving heavy loads.