Which of the following translates to "gear box" in German?

The term "gear box" in German is best translated as "Getriebe." In the context of mechanics, "Getriebe" refers specifically to the system that transmits power from the engine to the wheels of a vehicle, primarily consisting of gears and a housing. This term encompasses the function of a gear box, which is to facilitate the changing of gears and ultimately control the vehicle's speed and torque.

Other options do not accurately represent the concept of a gear box. For instance, "Kraftübertragung" means "power transmission," which refers to the overall system that transmits power but does not specifically denote the gear box itself. "Motor" simply means "engine," which is a different component of a vehicle. Lastly, "Freilauf" translates to "freewheel," which is a mechanism allowing a wheel to rotate without driving the engine. Thus, "Getriebe" is the precise term needed for "gear box" in German.