What method should be used to start moving without rolling back when stopped on a hill?

Starting to move on a hill without rolling back is crucial for safety and control. The correct answer involves downshifting, which refers to manually selecting a lower gear in a vehicle with a manual transmission. When a driver downshifts to a lower gear while on a hill, they can take advantage of the engine's resistance, reducing the likelihood of rolling backward. This technique helps maintain traction and control during the initial acceleration, allowing for a smoother start on an incline.

Using the parking brake or accelerating slowly can be helpful in specific situations, but downshifting provides a more reliable way to engage the vehicle's power through the drivetrain. Inappropriate usage of the parking brake can lead to other complications and might not be effective in all scenarios. Accelerating slowly is important for safe driving but, on its own, does not necessarily prevent rollback, especially on steeper inclines. Turning the steering wheel is unrelated to the process of starting on a hill and does not assist with preventing rollback. Hence, downshifting remains the most effective method in this context.