Final answer:
The optimum distance between the chest and the steering wheel is at least 10 inches to ensure safety and comfort while driving.
Step-by-step explanation:
When adjusting the driver's seat in a vehicle, it's important for safety to maintain an appropriate distance from the steering wheel. Ideally, there should be at least 10 inches (25 cm) between the center of your chest and the center of the steering wheel. This distance helps to reduce the risk of injury from the airbag should it deploy in an accident. The seat adjustment should also allow you to comfortably reach the pedals and have a clear view over the dashboard and through the windows.