Which technician correctly describes the function of a differential?

The correct answer reflects Technician B's accurate description of the differential's function. A differential is a crucial component in a vehicle's drivetrain that allows the wheels to rotate at different speeds, particularly during turns. When a vehicle turns, the outside wheels must travel a longer distance than the inside wheels due to the difference in their radius of rotation. The differential accommodates this difference, enabling smoother turns and better handling without skipping or dragging the tires.

Technician B correctly identifies this key function, illustrating an understanding of how the differential contributes to vehicle performance and safety. This allows for improved traction and control, particularly in situations where the vehicle's path requires varied wheel speeds.

In contrast, if Technician A did not capture this fundamental aspect or provided an inaccurate representation of the differential's purpose, that would clarify why only Technician B's description is correct. Understanding the differential's role is essential for diagnosing issues related to handling and drivetrain performance.